Ok, it's official, solicitors charge way too much (anyone particularly surprised?). I've just got a rough budget from a solicitor specialising in charities and for them to have a "light touch involvement" in us getting registered with the appropriate authorities will cost "between £1200 to £1500 (plus VAT)" (given their hourly rates, that comes to about 6 hours work, God knows how they call that "light touch" - it's just a few modifications to the models and a couple of forms!). I think we'll have to do it ourselves, hope we don't make any particularly serious mistakes and just find someone to witness it (which is what WER did, I believe - it seems the only way).