Not sure which town you mean (for me it's London, or, if I want to travel only 10 minutes, Richmond).
For me, checking out L K Bennett, Russell and Bromley, and Hobbs (20% off at moment) unmissable. Plus White Company if poss. And Comptoir des Cotonniers. And would definitely be Zara if I was slimmer. And Phase Eight. And other shops down Regent St, eg Banana Republic.
I'd also want to check out one of the larger Space NKs for latest products and/or Selfridges or Harvey Nichols make-up halls (and some of the rest of those shops if time). If you go to Space NK, I recommend Laura Mercier and By Terry.
Gah - what a day. Raining and yuk when I left home - so big rain coat and no sunnies. Got to Glasgow and was hot and sunny. Had to ditch outfit I was wearing and buy new Day Et Birk whatsiname dress and necklace. Couldn't find bra at home - but was ok cos I had a cardi trussed up. Had ditched the cardi - so had to buy new bra. Got a sloggi one for comfort during shopping. But the lady talked me into getting a HOF recognition card. 'It'll only take 2 mins!' she said. 50 mins later and I had almost missed lunch with the girls!