Re: replacment necks in the uk?!
WD and Allparts UK are both great but a little expensive.
Kavannagh customs was another UK supplier - although I justtried searching for them and it looks like they may be no more!
Touchstone tonewoods is another option - I ordered a cracking vintage strat neck from them years ago.
Brandoni used to stock 100s of NOS strat/tele necks. Apparently they bought a factory/warehouse and it was full of parts!
The other option is ordering from the US - I can recommend Warmoth. They make to order but also have a "showcase" which is full of ready made necks. You can choose finishing/fretting/nut etc. Be careful though - shipping/duty can add to the total value. It does workout roughly the same as WD/Allparts in the UK, but the quality cannot be compared.