The Z90SLP on e-bay eventually went for £1200 + shipping. So, eventually, the U.K. second hand market on e-bay may be the way forward.

However, in amoungst all this chat and research, I found Timbmet http://timbmet.com/ and now await their quote for supply and cnc for my requirements. I know the price will not complete with the Chinese but I hope it may fit my within my pricing structure.

I will, of course, post any progress here.