Well, this is good news, I was getting a little panicky about it!
Although, second question. Assuming I don't manage to get a TWP after my IEC permit expires (which is right on the two year mark) is there anything to stop me changing my status and remaining in Canada as a visitor for a few months (I think the limit is 6 months with a British passport) and applying for CEC from within Canada? Then possibly returning to the UK while my application is in progress or popping back and forth?
I don't know about the popping back and forth part, but it would be possible to change status to visitor and apply from within Canada, but you can apply from the UK too.