pine martin if the individual takes the said rifle and you have the details entered onto your firearms certificate you can have the rfd send you the rifle direct to your home.
you need to contact
enquiries.ilb@bis.gsi.gov.uk and speak to roy smiles who will issue you a firearms import liscence free of charge the rfd at the other end will sort out an export liscence which is around 35 euros. once granted you can fill in the details here but you need conformation first as it will block you if you have not sorted with roy first.
ICMS - Import Case Management System
once you have the paperwork you can send your papers via fax or email these documents stay with the rifle till it arrives inj the uk for you to sign on rifle arrival.
this is all above board and have personally done this in germany and all eu country are the same exept export liscence price might vary and courier costs also.
if you decide to go through someone in the uk it could cost alot for filling in the form it takes around 5 mins to do and only takes a few days to complete from start to finish, atb wayne