Hi Everyone

We are flying to Singapore via Doha and have a 2 hour layover (return flights layover is 50mins... eek). We want to buy duty free at Heathrow (Gin). will I be able to get this on the 2nd leg of the flight from Doha to Singapore???? or do I need to buy it at Doha Airport or on the flight (do they sell Gin Duty Free on the flights?)

Cheers in Advance
Gary