Teesside's four servers:
152.105.66.172:27015 Office only
152.105.66.174:27015 Standard maps
152.105.66.174:27030 Italy only
152.105.66.175:27019 Standard maps
They have the best settings I've ever seen.
One thing I don't like is that if you want to join one and it's full, you get auto-switched to another server, so bear that in mind if it's 39/40.