Thanks guys, all good stuf. The bike does have a granny ring, although not wholly ideal touring gearing. The tent is a two man Vango Shadow 200 so it's a bit too much for my purposes but, hey, why be cramped. I could invest in titanium tent pegs to shave a bit off. I'm maybe wild camping, no plan at the moment other than to get the ferry over to Dunoon and head west until I get weary, see what happens, so a stove is necessary. I will need to be careful about pot holes as the poster above says. I bought a 28mm Schwalbe Marathon today for the back wheel, and a spoke tightening tool will be a good idea. We'll give it a go and report back.
Cheers!