Thanks guys,
ajktsb - the description of the part on the packet is 'Jack Barrel PCB MT 2.5 mm DC power 3 pin' part no appears as 21-00-0014
psarkissian - I am based in Glasgow, Scotland. Not sure that there is an authorised service centre near me.
Re skill level - My soldering iron skills amount to me having swapped out pups on a few guitars and playing around with different wiring combinations , so while i know which end is hot , I am no expert.
I reckon that if I can get to the part ok , I could unsolder it and solder in a new one.
Stumblin man - you reckon you could walk me through the steps to getting to the part?
Thanks again for any help.