Thanks for the help, although I'm pretty sure I've tried them in the past and got nowhere.
On the plus side, I had a really close look at one of my non-working boards today and found that more than half of the legs on the two sides of the processor closest to the battery were just floating on a bed of crystaline solder so hardly surprising this one won't boot! Will resolder them tomorrow and see how she fares :-)
The one widely available is a very rough copy of an original (heavily compressed), I just wondered whether anyone had or has seen an original that could verify whether the schematic in it is legible. I have seen original manuals for sale on ebay so someone out there has one!
The bigger picture is that I plan in the longer term to remake this board so a schematic would save me a load of hassle.
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