In reply to robert-hutton:
> He isn't doing MB or if he is lightweight shoes as requested by organizers are some joke
Right - should have been clearer. It was just a 3-4 day TMB (3 nights, 4 days hiking).
Thanks by the way to everyone for their advice!
I've just returned yesterday and it was really fun - despite 3 out of 4 days having rain.
I found a pair of Scarpa BXX wide (old model - but unworn) on ebay and had the chance to try them out on a hike in Surrey hills with no issues , found them really comfy. So that's what I've gone for. I had also ordered some Targhee iii Mids as a back up but did not get the chance to wear them so went with the Scarpa's.
Initially I definitely felt their weight and they seemed overkill on the sunny, dry first day's hike. From the 2nd day onwards rain started and did not stop for the rest of the trip. Even though they did get wet (in an over ankle deep river) by the 3rd day, I don't regret having taken them on the trip.
They were great at providing grip on mud, on wet rocks and quite comfortable. I only got swollen toes at the end of the 3rd day after a particularly steep and long descent in wet boots.
On the final 4th day we got to about 2000m (at Col de Balme) and after rain faced snow/snowing - where again I was grateful to have the reliance of the firm grip. I also didn't really feel the cold at my feet despite (by this point) having gotten the boots wet. Fortunately we were only in the snow for about 90 minutes with a warm break in between the ascent and descent.