In reply to MrWayne:
Sadly not much around Chelmsford, hopefully someone will open something in the not-too-distant future!
Harlow is reasonable for lead but not great bouldering. High sports Basildon is pretty limited for both.
The Stronghold in Tottenham is an excellent new bouldering venue, 45 minute drive.
The Reach is a similar drive and has pretty good lead and bouldering.