Hi Sean, about YM - no need to supply them with full transcripts of your every single chat, just do screenshots of "YM archive" with overview of conversations and fully print just some of them as examples - try to print out the ones where you have been discussing something important (your visit, arrangements for the future, living together etc.). ECO aren't too keen to go through big heap of the evidence anyway, so make it bit easier for them.
At least that is what we did - and no problem.
Good luck
