It is indeed JW, home to what started as Rainham Amateur Theatrical Society aka RATS, back in the mid 60s.
My sister did a while as an active performer in those days. My mother was an active supporter until her death in 1989.
I remember it as a very small, intimate space, a real theatre in miniature, with a decent bar… oh and some very competent actors and singers, even writing and performing a complete musical during my sister’s time there.
Over to you JW