Well, I finished wiring it up yesterday, and the valves came in the post today and I couldn’t resist trying it out 
I’m very pleased to say that it works perfect first time, and it sounds awesome! (Going through the white tap into 16ohm V30)
The valves I’m using are :
Tung-sol 12AX7
Tung-sol 5881 (new re-issue)
NOS JAN 5Y3WGTA
Never had a valve amp before, but it seems a little toasty out the back? The glow is oh-so good though 
I’ll tell you how I solved the soldering to the grounding sheet problem : I put the sheet on a hot radiator for a while, then while it was still on there I did the soldering! The extra heat worked a treat!
I’ve added some photos to the gallery – Don’t know how to embed them onto here though?
I can’t thank you all enough for all the help!