This ^ How is your accountancy company going to do your accounts without financial data?

Well, they're not our accountants. They specialize in analyzing data and seeing where you can save money on taxes. Seems a bit shady to me, but then again I know nothing about finances!
As for sending the files. Just get your boss to email you saying its OK. If you're struggling to play Cover Your Arse in a 15 man organisation never get a job in IT in a huge Public Sector organisation. Playing CYA in one of those is a work of art, and full time job. Trust me.
The problem is though, in a small company like this there are no procedures in place.....people just make stuff up as they go along

A big company would most likely have a specialist who would take care of this. I have to do tech support, cover customer service, cover the warehouse, unplug the toilet and change the air-con filters up in the roof - all of which I've done over the past 2 days

On the plus side, I get to
put these procedures in place as they come up, which is kinda cool.
Anyway, UPDATE (I'm a few hours behind you guys...) - my boss got my e-mail and obviously realized "hmm, yeah, we shouldn't be so quick to hand over the data" - so he told me he's going to talk to our accountant again and make sure this other company is completely on the up-and-up. I think he was impressed that I showed caution and made him put the brakes on
As for the data being in an rtf format, well that's just the easiest way our software exports stuff. They seem to think they can work with it, but if not I'll have to try and get it into Excel or something else.....which it can probably do if I dig a bit deeper.
Thanks again, chaps!