Hey @Hussaroperator, welcome here
Since you're in N-London, do you have a car to travel around? There are some good sites around the area here, e.g. Airsoft Plantation (aka AP) + The Tower (run by AP), both in Billericay, Echelon Airsoft in Gravesend (till 22nd November), Red 1 Chislehurst in, well, Chislehurst, Incursion Airsoft (formerly known as EAG) in Epsom and Dorking, and a bunch of others probably too.