ShakeAway

Often imitated but never bettered (esp in other towns) Shakeaway not only has the funkiest music on the stereo and the youngest most cheerful staff, but it does blummin amazin' milkshakes. Any flavour you care to suggest is available (plus lots that you'd think of as just plain wrong) such as maltesers, apple crumble, ginger cake, smarties, marshmallow and fudge. All at the same time if you want. Plus you can add malt to your shake for that extra rich flavour. The menu is massive plus they have recipes, with three of four ingredients plus a topping (which gives you something to scoop out of the cup when the shake has all gone).
I think they also cater to the soy milk brigade...

Definitely worth a try, though I don't think I could manage one every other day like coldclimate. Try the simple fudge malt. Yummy. Worth the visit to Smelly Alley.