[Elecraft] Bringing a K3 into England

[Dennis]

I know this is OT, but I'm looking for some help from some of our G 
friends in the UK.

I'll be traveling through England on my way to Bulgaria for the LZ Field 
Competition.
I will need to bring my K3, computer, cables, etc. into England for the 
3 days I am
there, then transport them on to Bulgaria, then back to England for a 
day for the
return trip.  Of course, I don't wish to pay any import duties, as I 
will be taking it
with me both to Bulgaria and back to the USA on the return trip.

What is the best way to accomplish this?  Paperwork, declarations, or ?

Please reply off list, so the list isn't encumbered with this OT request.

Dennis W1UE