I hope there's no problems ordering directly from DJI as I've just done exactly that!
A P3 Advanced with extra battery is now on order. Only a £379 upgrade as I sold my P2V+ for £600 I know I could have saved by getting it in Euros but I just wanted it ordered and now I can forget about it until it arrives.
I spoke directly to DJI yesterday and asked exactly what was included in the shipped price of £1159. They said that all VAT and Import duties (for the UK) are included and that they 'take care of that at their end' so ordered mine too.