I as thinking of the hard skin removing cream for the initial problem literatin but what you suggest would be better for Charlie's current condition.
Yep, didn't mean 'don't bother with the kind of foot cream LMH suggested', more 'don't bother with the foot cream of the brand I just linked to cos their hand cream does the trick' - sorry for ambiguity.
I would be concerned that it is only two weeks after London and you are planning to do two interval sessions, a fartlek and a tempo run all in the same week. I'd need a lot more recovery time than that in order to run a good half marathon seven weeks after a marathon.
I think I was doing it right but it was probably not the best bike in the world, and I was only doing it because I had an achilles problem and couldn't run but was used to doing 20-milers, so 45 minutes of intermittent effort was a bit disappointing. That was also the period when I used to get around town on a bike that had three gears but only one of them worked, so I had quite strong hill climbing muscles! No digital displays or any of that shit, just lots of manual knob-cranking.