Should have been simple - swop the tyres on my road bike, hour and a half later... Everything that could go wrong did

tyre on wrong way round - corrected - oh flip it was correct first time

-fitted on correctly and tried to pump inner tube up - valve failed

all off, new inner tube and tyre refitted but did not spot the slight misfit so pumped up and found the inner tube bulging out of the tyre

. Sorted that out and finally got the rear wheel done. Then the turn of the front wheel which thankfully went okay.