Reading up on wrapping it seems that the problems with destruction of the pipes are associated with manifolds that are completely wrapped and this cooks the steel. I've ordered a long roll of the stuff and will wrap just the 10 inches or so that will run near the gaiters. Hopefully it will prevent the gaiters cooking and not cause the pipes to fail.
Job done! £2.50 for 10 metres of the stuff, including postage. Chineeze, obviously, but you can't argue with that sort of price. Included some stainless steel ties as well.