I'm needing to write a fairly detailed terms and conditions (which includes such conditions as server downtime acceptability and associated penalties).

We need to have something pretty tight as our customers will predominantly be from the legal industry.

What is the best place to go for advice on this?

A lawyer can write up these t&c for you. Try Watson Easom, they do this sort of thing.

Oxley & Coward (Rotherham), ask for Rebecca Stopford, she's a partner solicitor specialising in e-commerce/web.

Thanks, appreciate it.

Yeah, I forgot about Rebecca, a vote for them too.