Thanks for the advice!
I went to the agency tonight and everything went well, I feel comfortable with working for them and said I would start next week.
I wore a nice tight fitting dress with heels, which went down well and they said it would be perfect to wear for a client. Well, when I got home I kicked the heels off and unzipped the dress...only the lining got stuck in the zip and wouldn't move! I've just spent the last half an hour trying to get the bloody thing off, and eventually had to take scissors to it. Imagine if I had worn it for a client, got there and hadn't even been able to get my kit off! Would only happen to me!