Cheers Clairster - still not as awesome as watching you complete your 100th marathon last month!
Martin - keep it simple with the pedals. Toe clips are fine at first and you can wear your running shoes while you're cycling. Saves you money and a guaranteed embarrassing fall the first time your cleat fails to release as you slow at a traffic light... Personal experience with scars to prove it!
I like the cut of your jib, Martin! Anyone who mixes up parkruns, marathons and is heading towards the dark side of multi-sport is all right by me! I admire people who dedicate their training towards one distance or discipline, but personally I love the challenge of running a parkrun off long distance triathlon training and taking part in great local events. It's not an approach that'll get me onto the podium, but it's great to mix up the training . You certainly don't have to travel too far from home to enjoy parts of NI that you'd never otherwise visit.
The Wall's a great challenge to aim for. As Paul said, I had my only DNF in 8 years of racing there last year when I snapped my bike chain a couple of miles into the ride and didn't have a chain tool with me. I completed the final run as a training run anyway.
Don't worry too much about planning kit or nutrition at this stage. Get used to the bike first then practice riding for an hour or so then heading straight out for a short run afterwards. I'll catch up with you at a race soon!