Yeah it's Levenes, I spoke to Michael this morning.
The pain is weird - it can affect me quite badly when I'm walking anything more than a few hundred metres, but I can cycle all day long without issue. I don't know whether this is psychosomatic or mechanical.
I am wondering whether I can claim for the extra cost of using TfL transport. Normally, I cycle everywhere all the time - even going into and beyond the centre of London. However, with the bike at the shop, that becomes nearly impossible (I've even resorted to hiring a Boris Bike twice - a very odd experience) so I've been using the DLR a lot more, even just for nipping to the shops as walking there, although not overly far, is quite painful.