Hi there and welcome!
My slant is be carefull.
1) I think you will still pay import tax and VAT.
2) If it goes wrong, how will you get it fixed, setup and parts?
3) Beware of how you pay.
In my opinion it would be better to get good instruction here in the UK and see if your instructor knows of any good deals, or if you purchase second hand get him to look over it before purchase. Most equipment mistakes are made in the early days of learning to Paramotor. Look on this website for second hand sales and another good place is http://www.paramotorsuk.co.uk/ I also think buying a good wing is first, as you can ground handle and really get used to that. Once you can do that well, then adding a motor is next.
This is only my opinion of course.
Any ways best of luck with it all.
Mikey