I need to sort out payment and collection but it looks like it will be
It's a Bosch fly-by-wire pump which from what I gather essentially means a Bosch-VE with electronic throttle rather than a nice mechanical rotary arm controlling the governor.
The symptoms sound a bit like pump shaft seal failure, if that's the case hopefully isn't too much of a big deal; I think on that engine it can be changed without removing the pump as it's driven off a belt from the rear of the engine. So belt off, gear off, seal out and in, reverse. It's that or the crankshaft position sensor is on the way out.
Either way shorting a couple of ECU pins gets it to blink out fault codes using the ECU light on the dash. (Used to work for an ECU diagnostics company so this is safe territory for me!) so I think this is the place to start. And the crankshaft sensor is fairly straightforward to test.
From the listing the document from the diesel injection specialist says "unable to see fuel pump" - it's pretty hard to miss hanging off the right of the engine..(!) Worst case is replace the whole pump, given there was a guy selling them on eBay for £17, it's just the spanner time extends into a few hours for that kind of task.
Nice bus just needs some TLC, I'm just hoping it's within my capabilities
