Quite possibly they should have their own web site, but given how impossible it is to google any information about this, allow me to provide it all here in one place.
This was accurate as of a phone call today (21 Sept 2008) with Tom Draper, but may no longer be accurate.
Contact Person: Tom Draper
Tom's Phone Number: 020 8874 1575
Fircroft Primary School
They play Monday, Wednesday, and Friday.
18:00-19:30 - Children
19:30 - 22:30 - Adults
Cost is 3/session if you pay for a 12/year annual membership, or 4/session otherwise.
They have some changing rooms, but because it's a primary school, they don't have full locker room and shower facilities.