studied with interest recent tests of pumps & booster/pumps . checked out web sites of the 2 highest rated products only to find that one only supplies via net and adds a wopping £11 carriage. The other appears to only supply wholesale with minimum order of 2 units. wonder if P.C. or anyone else can advise retail outlet for either Hamilton Classic or Michelin 12250. find the product tests are great but not really much use if an article cannot be bought over the counter somewhere. Mick