Does anyone know if the Fortnum and Mason store is a store on its own or is it within the Duty Free store?
I want to ask someone to do me a favour and buy something for me and I want to make it as easy as possible for her. I'd like to give her specific instruction on where it is .

LHR has a good website that will net this information.

There's no free standing Fortnum's anywhere except Piccadilly and St Pancras.

If F&M still has a concession within World Duty Free, it's not shown on the WDF T5 floorplan (http://issuu.com/worlddutyfree/docs/...237896/2595636)

This raises the possibility there's no concession any more: just a few F&M products on WDF shelves. It might be worthwhile emailing F&M to check WDF stock it at T5

I'm familiar with T5 and don't remember a Fortnum and Mason. No store but they may have a few products for sale in the duty free area as flanneruk mentioned.There is a small Harrods store with the usual Harrods souvenir items.

Thank you all very much for the help. I am very sure I bought tea at the duty free the last time I was there.
Perhaps there are a few products in the fine food section, as you have suggested. I hope so, because I do enjoy the Fortnum and Mason tea.