I did it with Nirvana, because it was my first IM and I wanted it as hassle-free as possible. I have to say, it was all very easy. That said, plenty did it the other way, if you're going to have a car and someone going out with you to watch (and drive you around) it's fairly straightforward. Not sure of the logistics if you're travelling alone, but someone will be along soon to tell you that I'm sure.
Similar yesterday padams - 5 miles lunchtime. Riding home later was much nicer. Having ridden in again today (no school run this week) I'll probably run home, which might be advisable anyway if the predicted thunderstorms materialise.
padams/LMH/CW - I've heard a bit about run-walk as a genuine strategy in IM rather than a last resort, even for quicker runners. Theory is that you can run a bit quicker in the 9 minutes to make up for the minute walk, and maintain a more constant pace through the run. I'm thinking of trying it for Mallorca because it's bound to be hot, and in the past I've struggled big time at the end of IM marathons with the exception of Wales which was much cooler. At worst it might cost me a few minutes over an optimal run, but that's a much riskier approach as you know!
Tidy 10k CW, and SC2 as well. Warm for running yesterday.
TT, only thing I'd add is that if you're comparing overall trip average speed between the two, rather than steady, flat open road speed, then the gap will be smaller because there'll be sections of the ride (lights, traffic, bends etc) where the speed is dictated by things other than the bike. Good to see you've entered the Ballbuster, I think you'll do pretty well in that.