I'd like to have some kind of cover for the mainsail, so that I can leave it on the boom but wrapped up and covered so it is a) tidier and b) slightly less of an obvious target for theft/mucking about.
How much do you want to spend? Two years ago I got a local sailmaker in Cornwall to run me up a very nice canvas boom cover, complete with all the lacings you might find on a bigger yacht for £125. I can supply his details but I doubt he has kept the measurements I gave him.