Regional 1 South East
Regional 1 South East is a level five league in the English rugby union system. It is one of six leagues at this level. When this division began in 1987 it was known as London Division 1. The format of the league was changed at the beginning of the 2009–10 season following re-organisation by the Rugby Football Union while the name change from National League 3 to Premier was introduced for the 2017–18 season to make it more obvious that it is a regional league. London & South East Premier was the highest regional rugby union league covering London and south east England. Following the RFU Adult Competition Review the league was decreased from 14 to 12 and the name changed to Regional 1 South East. Part of the area formerly covered by London & South East Premier is now covered by a new league Regional 1 South Central.
Oundle are the current champions.
Format
The twelve teams play home and away matches from September through to March, making a total of twenty-two matches each. The results of the matches contribute points to the league as follows:- 4 points are awarded for a win
- 2 points are awarded for a draw
- 0 points are awarded for a loss, however
- 1 losing point is awarded to a team that loses a match by 7 points or fewer
- 1 additional point is awarded to a team scoring 4 tries or more in a match
Season 2025–26
Departing were Oundle, promoted to National 2 East whilst Harpenden and Bedford Athletic were relegated to Regional 2 Thames and Regional 2 Midlands East respectively.| Team | Ground | Capacity | City/Area | Previous season |
| Amersham & Chiltern | Weedon Lane | Amersham, Buckinghamshire | 10th | |
| Colchester | Raven Park | 1,200 | Colchester, Essex | Relegated from National 2 East |
| Hertford | Highfields | Ware, Hertfordshire | 6th | |
| Letchworth Garden City | Legends Lane, Baldock Road | Letchworth, Hertfordshire | Runners-up | |
| Medway | Priestfields | Rochester, Kent | Promoted from Regional 2 South East | |
| North Walsham | Norwich Road | 1,200 | Scottow, Norfolk | 5th |
| Old Northamptonians | Sir Humphrey Cripps Pavilion | Northampton, Northamptonshire | 4th | |
| Shelford | The Davey Field | 2,000 | Great Shelford, Cambridgeshire | 8th |
| Southend Saxons | Warners Park | 1,500 | Southend, Essex | 9th |
| Sudbury | Whittome Field | Great Cornard, Sudbury, Suffolk | 3rd | |
| Tring | Pendley Sports Centre | 750 | Tring, Hertfordshire | 7th |
| Westcliff | The Gables | 1,000 | Eastwood, Essex | Promoted from Regional 2 Anglia |
Season 2024–25
Departing were Colchester, promoted to National League 2 East whilst Rochford Hundred and Westcliff were relegated to Regional 2 Anglia.Joining were North Walsham, relegated from National League 2 East, together with Amersham & Chiltern and Southend Saxons, promoted from Regional 2 Thames and Regional 2 Anglia respectively.
| Team | Ground | Capacity | City/Area | Previous season |
| Amersham & Chiltern | Weedon Lane | Amersham, Buckinghamshire | Promoted from Regional 2 Thames | |
| Bedford Athletic | Putnoe Woods | 500 | Bedford, Bedfordshire | 10th |
| Harpenden | Redbourn Lane | Harpenden, Hertfordshire | 3rd | |
| Hertford | Highfields | Ware, Hertfordshire | 7th | |
| Letchworth Garden City | Legends Lane, Baldock Road | Letchworth, Hertfordshire | 4th | |
| North Walsham | Norwich Road | 1,200 | Scottow, Norfolk | Relegated from National League 2 East |
| Old Northamptonians | Sir Humphrey Cripps Pavilion | Northampton, Northamptonshire | 9th | |
| Oundle | Occupation Road | Oundle, Northamptonshire | 6th | |
| Shelford | The Davey Field | 2,000 | Great Shelford, Cambridgeshire | 5th |
| Southend Saxons | Warners Park | 1,500 | Southend, Essex | Promoted from Regional 2 Anglia |
| Sudbury | Whittome Field | Great Cornard, Sudbury, Suffolk | 2nd | |
| Tring | Pendley Sports Centre | 750 | Tring, Hertfordshire | 8th |
League table
Season 2023–24
Departing were Westcombe Park, promoted to National League 2 East whilst Medway and Sidcup were relegated to Regional 2 South East.Joining were Rochford Hundred, relegated from National League 2 East, together with Letchworth Garden City and Old Northamptonians, promoted from Regional 2 Anglia and Regional 2 East Midlands respectively. Also coming in were Oundle on a level transfer from Regional 1 Midlands.
Participating teams and locations
| Team | Ground | Capacity | City/Area | Previous season |
| Bedford Athletic | Putnoe Woods | 500 | Bedford, Bedfordshire | 7th |
| Colchester | Raven Park | 1,200 | Colchester, Essex | 3rd |
| Harpenden | Redbourn Lane | Harpenden, Hertfordshire | 4th | |
| Hertford | Highfields | Ware, Hertfordshire | 9th | |
| Letchworth Garden City | Legends Lane, Baldock Road | Letchworth, Hertfordshire | Promoted from Regional 2 Anglia | |
| Old Northamptonians | Sir Humphrey Cripps Pavilion | Northampton, Northamptonshire | Promoted from Regional 2 East Midlands | |
| Oundle | Occupation Road | Oundle, Northamptonshire | Transferred from Regional 1 Midlands | |
| Rochford Hundred | The Rugby Park | 1,000 | Hawkwell, Rochford, Essex | Relegated from National League 2 East |
| Shelford | The Davey Field | 2,000 | Great Shelford, Cambridgeshire | 2nd |
| Sudbury | Whittome Field | Great Cornard, Sudbury, Suffolk | 8th | |
| Tring | Pendley Sports Centre | 750 | Tring, Hertfordshire | 5th |
| Westcliff | The Gables | 1,000 | Eastwood, Essex | Relegated from National League 2 East |
League table
Results
2022–23
Six of the twelve teams participated in the 2021–22 competition. They are joined by Shelford, Sudbury, Colchester and Harpenden, all promoted from London 1 North, together with Medway and Bedford Athletic promoted from London 1 South and Midlands 1 East respectively. Sutton & Epsom, Maidenhead, Havant, Wimbledon and Brighton were level transferred to Regional 1 South Central. Other teams leaving the division were Dorking, Sevenoaks and North Walsham who were promoted to National League 2 East. There was no relegation from the league at the end of last season.Participating teams
| Team | Ground | Capacity | City/Area | Previous season |
| Bedford Athletic | Putnoe Woods | 500 | Bedford, Bedfordshire | Promoted from Midlands 1 East |
| Colchester | Raven Park | 1,200 | Colchester, Essex | Promoted from London 1 North |
| CS Rugby 1863 | King's House Sports Ground | Chiswick, London | 14th | |
| Harpenden | Redbourn Lane | Harpenden, Hertfordshire | Promoted from London 1 North | |
| Hertford | Highfields | Ware, Hertfordshire | 4th | |
| Medway | Priestfields | Rochester, Kent | Promoted from London 1 South | |
| Shelford | The Davey Field | 2,000 | Great Shelford, Cambridgeshire | Promoted from London 1 North |
| Sidcup RFC | Crescent Farm | Sidcup, London | 9th | |
| Sudbury | Whittome Field | Great Cornard, Sudbury, Suffolk | Promoted from London 1 North | |
| Tring | Pendley Sports Centre | 750 | Tring, Hertfordshire | 10th |
| Tunbridge Wells | St Marks Recreation Ground | 3,000 | Royal Tunbridge Wells, Kent | 13th |
| Westcombe Park | Goddington Dene | 3,200 | Orpington, London | 6th |
Final league table
Results
2021–22
Nine of the fourteen teams participated in the 2019–20 competition. They are joined by Sutton & Epsom who were relegated from National League 2 South, along with three promoted sides; Havant, North Walsham and Westcombe Park. Maidenhead who played in South West Premier in 2019-20 were level transferred into London & South East Premier as the nearest club geographically to address an imbalance of teams in the league. Teams leaving the division included Rochford Hundred who were promoted into National League 2 South as champions along with Guernsey Raiders who won the virtual promotion play-off against Weston-super-Mare RFC, while teams relegated from the league included Bedford Athletic, Guildford and London Irish Wild Geese.The teams competing in 2021–22 achieved their places in the league based on performances in 2019–20, the 'previous season' column in the table below refers to that season not 2020-21.