This is one subject where you should get the answer direct from the horses mouth- ie Customs & Excise. Check their website or give them a call.
Many (if not most) imports from outside the EU are subject to a) a customs duty, plus b) VAT at 17.5% (our rate not the vendor's) on the value of the item PLUS its shipping cost. Yes, really!
Some imports 'slip' through the net, but something the sizeof an mv might not.
You never know, there may be some exception relating to articles of historical interest or whatever ( I doubt it) but check with C&E or you could have a nasty surprise.
Good luck.