Boots do a repeat prescription delivery or collect from store service without the need to visit your doctor. They contact the doctor and obtain the repeat prescription service and you or your representative can either collect from a store or they will Royal mail 1st class post it for £2.90 to a UK address. It does need to be signed for and excludes refrigerated or controlled drugs.
Handy if you have someone who could post them on when you are abroad for a few months. See Boots on-line prescriptions