Surprise, surprise on the day the account totally shut down. I called in a panic and after a lot of fiddling about (and reassuring me that they had recorded that I thought there might be a problem) they got it back up with everyone's mail after almost a whole day of downtime.
To add insult to injury Google don't run a charity program in the UK despite the non-profit laws being a lot stricter than the US and it being easy to validate a charity - so they're paying full rate for Google Apps for Business.