Managed to source some NOS items which should look great once the bike goes back together. The TDC freewheel had at some point in its life had been relieved of the 'fifth' gear cog - probably for a single speed bike. I managed to get hold of a NOS one from of all places - Portugal!
Next up - I'm not sure if this company originally supplied Raleigh but this handlebar tape is certainly the closest match for what was on the bike. Advance Tapes were based in Leicester so it's not a far stretch from Nottingham to assume this could have been supplied to Raleigh. Anybody know?