Here we are:
Cleaned and resprayed tank with red-purple lacquer (3 coats), cleaned guard (although still a bit corroded, perfectly functional), had to replace pump housing (it broke at the thread), cleaned everything else, and replaced washers and pump leather with Service Pack.
Service pack, mantles and pump spares from
http://www.base-camp.co.uk who also gave me some advice and tips - brilliant company so please use them.
So, lamp was free from Chas (cheers mate!),
Lacquer was 3.00 from eBay
Pump spares, mantles and service pack from Base Camp, about 13.00
So, whole lot about 16 quid. Still need to clean out the vapour tube but nearly all sorted now.