I do controller port mods, i'm also based in the UK. I have very professional soldering skills so theres no worries there.
Have you not seen the UK B/S/T thread? you should check it out, theres some pretty good stuff there.
How much you looking to be paying for the controller ports?
If you send your ports in i can either mod those or sell you some pre-modded ports so let me know.
I'm very fast and reliable and have been recommend loads of times in there so you can have trust in me, and i have plenty of X-S refs and great eBay feedback that you can contact / see on request.
I too have been done over by PayPal there seller protection policy just doesn't exist! i would recommend EVERYONE to consider different payment options, i accept nochex and personal cheques etc so thats no problem.
PM me mate or email me email@example.com with all the details of stuff and we'll sort something out.