Thank you gents for the prompt replies. Yes I think the best way is for the pulleys on the outside. I have included a photo to show what's been done and another showing how high it was riding on the large sprockets - and yes I think a new chain is needed so will order same soon. One last shot showing the brake lever where the chain has worn into it, so will need to make sure it stays clear when all is put back together. Thanks again.
