Yes you may have to pay import duty if you get caught, its VAT on the value of the item above $50 I think
+ a handling charge of about £8 + another £8 for some other Bollox if I remember right.
It all depends, Iv had about 50-50 on paying for stuff, so you may be lucky
You can mark the value down (under $50) or mark it as a gift, might work