Duty Free Allowance / Tax Free AllowanceWhen travelling from the EU* to the UK you do not have to pay any tax or duty on goods you have bought in another EU country as long as tax was included in the price when you purchased the items, the items are for your own use, and have been transported to the UK by you. This includes gifts, but does not include any item that is intended to be used as payment or to be resold.
If you bring back large quantities of alcohol or tobacco, a Customs Officer is more likely to ask about the purposes for which you hold the goods. This will most likely be the case if you appear at the airport with more than:
3200 cigarettes
400 cigarillos
200 cigars
3 kg of smoking tobacco
110 litres of beer
10 litres of spirits
90 litres of wine
20 litres of fortified wine e.g. port or sherry
Please bare in mind you are limited to how much weight you can carry. Check with your flight provider
It is an internal EU flight so can bring what you want - as long as it is believable that the whole stuff is for your personal consumption and/or gifts.
Carrying more is not illegal, but for commercial amounts there is still paperwork, if no fees.