Started to dismantle the old wheels to get the hubs out, so these can be re-painted and be ready for assembly in the new rims. After taking some carefull photos so that the lacing pattern can easily be identitied I managed to unscrew most of the spokes - only one or two needed to be sawn thru to release the hub. The front wheel still had its old tyre on and this had to be sawn off so I could get to the nipples to unscrew. All going well so far.