Sorry but no and no.
You can buy duty free at Dublin on your way out provided your ultimate destination is outside the EU and you have a through ticket
Of course Soonas, thank you for the clarification. My reading of exiting the airport was taken to mean landing in Dublin and buying it on the was out of the airport to stay in Dublin.
If you are planning to buy booze to consume while you are in Ireland, you'll find it (particularly spirits) significantly cheaper to buy duty paid at Heathrow rather than waiting until you get to Dublin to buy it.
Duty paid goods are sold in the 'duty free' shops. Basically there are two prices for each item - duty paid and duty free - and which one you will be charged will depend on the final destination on the your boarding card which you will be asked to produce when paying for your goods. As has been explained, there's no duty free for travel within the EU so you'll only be entitled to purchase duty paid goods for your London to Dublin flight.
If you will be in London before your flight to Dublin (rather than just transiting at LHR), then you might find that bottles of spirits are even cheaper in supermarkets than at LHR. But the downside is if you do purchase them in a supermarket or elsewhere you'll have to pack them in your checked in luggage as liquids of that volume won't be allowed past security. If you buy duty paid goods after security at LHR, you can carry them on to your flight as hand baggage.
The only problem as I see it with buying duty free (or duty paid) at airports is that you are incresing your cabin luggage. It is becoming common that European airlines only allow for one item of cabin luggage and have weight restrictions.
Worth checking this out before you make that purchase.
Hi again aussiTerrigal - in our experience of flying with both Aer Lingus and BMI from Heathrow to Dublin (the only two airlines which fly LHR to DUB) you should have no problems taking your duty free/duty paid purchases on board as hand luggage.
We usually fly this route with hand luggage only (mostly with EI) and have never had any difficulties taking on bottles purchased in the duty free/duty paid shop as well.. We'll be putting this to the test again in early November when we will be stopping off in the duty free/duty paid shop at LHR's Terminal 1 on our way to Dublin with Aer Lingus to load up with some pre-Christmas liquid cheer before boarding along with our cabin wheelie bags. We can update you after that, if it's of any help!Edited: 20 October 2010, 06:26
tapl - When you have "put to the test", you might let us know for certain.
Todays UK budget cuts will enevitably mean that there will be changes taking place in all sorts of areas, not least duty and tax increases alredy announced.
We flew back from London Heathrow with Aer Lingus last night. Our flight was full but we had no problem at all boarding with two regulation sized wheelie carry on bags, a handbag, a carrier bag with bits of shopping and..... most importantly....... two bottles of "mothers' ruin" purchased in the duty free/duty paid shop past security in Terminal 1.
We paid £11.50 each for 70cl bottles of Gordon's Gin. Now where's the lime and tonic.... chin chin!