Thanks for your help. These are my first posts on APUG, and the wealth of information and experience on this site is simply amazing.

As for the 138S, if I can get it cheap enough (and I mean cheap) I will buy it for spares if it is not complete, then carry on looking for a nicer unit.

Finally, coming back to the L1000 I will try the local Durst spares shop http://www.northernphoto.co.uk (a great source for older spares) to see if they have the glass mounted filters otherwise I'll just jerryrig something up as I really want to try a condenser enlarger on B&W.