I'm in the same position as you and discovering that some spares are hard to find (and very expensive if you do).  Try ebay and keeptheheaton.com. or try Google searches for a specific item (have you got the list of part numbers?).  These old boilers are pretty inefficient by modern standards now (50-60% efficiency v 80-90%?), so we may have to bite the replacement bullet soon.  What's wrong with yours?  John
                 john1000
                
 December 2007