Originally Posted by
Duke787
Which OP will have to do -- there's no avoiding transit security at LHR on this (or any other international) itinerary. If OP wants a duty-free liquid OP will need to wait and purchase at LHR.
Otherwise if OP is just buying non-liquid products as noah said it's a "yes"
Originally Posted by
noah
Yes, but beware liquids which won't be allowed as carry-on bags if you have to re-clear security at Heathrow or elsewhere.
Almost every airport in Europe and the US and also in many other parts of the world will let you keep duty free liquids on your carry-on bag, contrary to what FAs sometimes announce before landing. As long as the liquids are in a tamper-proof transparent bag and display a receipt, OP should be fine.