St lucia - UK export

[scooba]

What would you think from a visit this year the dealer offered 15% off and a duty free sale another 15% back ,So 30 % off a new WG GMT Pepsi ? I won't be going back till Easter 2015 and I hope there will be some kicking around by then ,I will ask Harry to have it in stock for my visit ,

What are the pit falls duty on my return to the UK if I choose to declare the item ? at 20% ?

Alternatively purchase from EU at a decent price and no duty issues accept I won't be getting 30% but maybe mid 20% off list

I am curious what others have done