If you are looking for buying EdT/EdP, know the brandname you are looking for, Wilkinsons instore seem to have best prices as compared to other high street stores. You have to know what you are looking for as they don't have any testers in store in Wilkinsons (streamlined shop to give us best price?).
For example She (eau de parfum spray) from Emporio Armani - is available in Wilkinsons instore for £17.97 but other high street shops have it for £28-29 range. (Buying online from them with home delivery might not be so good due to added postage)
It is great tip to find best prices for your EdT/EdP, so wanted to share it, even if it more an open ended deal. If you could please add some heat, so more of us will know.. Thanks!