Candle wax worked a treat. Finding the stick of bees wax may have taken weeks. You should see the state of my garage! The zip now slides like a very sliddy thing.
The suit is now 3rd hand and was not washed off because it was being replaced. I shall try to give it the TLC that the 2 former owners gave it when it was new to them.
Talc sounds a good idea. Anything to help get it on and off, and extend its life. I may even smell a bit better than usual when I ge home
Again, many thanks for the quick replys.