Had a few hours spare this evening, so after a good cleanout I've got version 2 in the fermenter. Re-hydrated the yeast this time after the last disaster although suspect something else was at play (I do wonder if the wort may have been a touch on the high side when I pitched the yeast but given it says to re-hydrate in 30-35C water I can't see that 22-23C would kill it. Who knows. Anyway, managed to get it from grain to fermenter in about 3 hours (minus the time for the strike water to come to temp but I was walking the dogs/doing dishes etc. meantime anyway so doesn't count!).