Each year clubs in this division also take part in the RFU Junior Vase – a level 9–12 national competition.

Departing were Chew Valley II, promoted to Counties 2 Somerset, while Stothert & Pitt (9th) and Bristol Telephone Area (12th) were relegated.

Joining were Burnham-on-Sea II, Cheddar Valley, Crewkerne and Tor.

This was the first season following the RFU Adult Competition Review[1] with the league split into North and South divisions.

Departing were Old Redcliffians II, promoted, together with Cheddar Valley (7th) who took a voluntary relegation to Counties 4 Somerset South and Morganians (11th) who withdrew from league competition.

Taunton II (11th in 2019-20) started but did not complete the season leaving eleven sides to contest the remaining fixtures.