Manual for a Halstead Quattro combi?

Hi.
Would anyone be able to give me a manual for a Halstead Quattro combi boiler please. The boiler has cost me a fortune with repairs by Corgi registered technicians. Now the diverter valve has been replaced, and the technician cannot restart the system. He's asked for a manual - which I cannot find. The kind bods on a few sites want to charge £25 - £30 for one, which, after all the expensive repair work and hassle, is just unbelievably expensive. If anyone would be kind enough to point me in the right direction I would be grateful.

Thank you.

Jon Smale