Thank you DebW and ny biker - that worked!! I was pretty conservative in how much change I made but took the bike out for a short spin afterwards and it's sooooo much better. I'll be riding about 30km tomorrow, which should be a good test.

I don't know why it didn't occur to me to ask the fitters if this was possible. It's not mentioned in Speedplay's leaflet in the box with the pedals, but surely the fitters should have thought to check?!!

Never mind - TE to the rescue again!!!!