Red 1 has announced the last game day at Chislehurst is this weekend and they are moving to Fawkham... I hope it's a brand new site, but I am guessing the old Bedlam Paintball site (Which was briefly used by Mayhem SE (The Kent based one) or they might share the Ultimate Wargames site.
This is significant as both Bunker and Chislehurst have shut down in a couple of months, which means only three active sites still left within the M25 (And only just!)
D&A Dropzone in Swanley, Tactical Warfare in Croydon and Mayhem in Abridge being the last three.
Edit: They are site sharing with Ultimate Wargames. I assume they will rotate weekly, UG being on Saturdays and R1 beings on Sundays. It's a shame because Chislehurst used to be a bus ride away from Central London. Fawkham is two trains and a 1 hour walk uphill.