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You can buy Alli in the UK from any pharmacy without a prescription. But it's also available online from boots. Some pharmasists seem to require that you have a consultation so you need to decide upfront if you want to go through the consultation process or buy direct from the internet.
If you buy on-line Boots is probably the best place to get Alli as they have all the info you need including how to check your BMI.
However the best deals at the moment are from Slimming.com and the saving is quite large.
What ever way you choose to buy your Alli it's always advisable to talk to your doctor first.