Originally a single division called Gloucestershire/Somerset, in 2000 the division split into two county leagues called Gloucester Premier and Somerset Premier and subsequently adopted its new name following the RFU Adult Competition Review at the end of season 2021–22.

Joining were Clevedon and Midsomer Norton, both relegated from Counties 1 Western North.

The 2014–15 champions Gordano were promoted to Western Counties North while Bristol Imperial and Clevedon II were relegated to Somerset 1.

When league rugby began in 1987 this division (known as Gloucestershire/Somerset) contained the following teams: Originally Gloucester Premier and Somerset Premier were combined in a single division known as Gloucestershire/Somerset, involving teams based in Gloucestershire, Somerset and Bristol.

It was tier 8 league with promotion to Western Counties[b] and relegation to either Gloucestershire 1[c] or Somerset 1.

Further restructuring meant that promotion was now to Western Counties North[g], while relegation continued to either Gloucester 1 or Somerset 1.

The team with the superior league record has home advantage in the tie.