Hi Matt
Q1 - Can't help you on that one, sorry.
Q2 - Does this link help?
Northern Ireland Small Claims Guide and new NI online claims service
Q3 - As far as I am aware you can claim on behalf of someone else, but I am not 100% sure. It is possible that the guides in the above link may give you an answer. (Or in the FAQ's on this site.)
Q4 - Bit of a tricky one - my turn to ask questions:
Did you use the template letter from here for your Prelim?
And did you send it Recorded Delivery or similar? In which case the date of receipt should be checkable, and I would assume that the letter was dated the day before?
If yes to both, then you should be okay reproducing it, back-dating it to the day before receipt, in my personal opinion.
The Prelim letter should form part of your Court bundle, but you are a long way off from that, and may not have to produce one.
Hope that helps a bit, but don't take any of what I have said as gospel - have a look at the A-Z guide, and the FAQ's, for more guidance.
http://www.consumeractiongroup.co.uk...hat-youre.html
Best regards
Jo xx