The first method I tried was to place ziplock bags of water in them and put them in the freezer overnight.
Next day, remove the ice bag and wear the shoes around with thickish socks. Better but still a bit tight, so I tried trick number 2, which is heat them with a hairdryer and flex feet in them. Sure enough, now they fit pretty good.
I've been busy making bits and pieces, getting ready for the pre-Christmas markets, here's a little view of some of my driftwood artworks.