Yet even a few more bits picked up from ebay.
This time, mostly for my surface grinder, and my quest for getting tooling shaped and sharpened.

At the back are three diamond edged grinding wheels, from L to R, 6mm wide (used, 1.5mm left), 1mm slitting disc (used, 3mm left) and a new one at 12mm wide. All very, very reasonably priced. The first two, less than 6 squid each, and the new one 36 squid.
In the middle are a few bits of metal from the same chap I got the used wheels off. The brass was especially needed. I have a future project to make some commercial engines, and it uses 1/4" thick brass plate. This piece will make up the shortfall I have in my stock for completing them. Again, hardly any cost at all, just a few quid for the lot.
The tooling, and the spare brand new wheel, is the key to using diamond wheels on my surface grinder. It is called a brake dresser, and is used for levelling off and cleaning up the surface of diamond edged wheels like I have bought. The one you see here is a genuine Norton one, in perfect working condition. New, this would cost you in excess of 1K bucks. I won it with a sniping bid of 36 squid, and that included the new spare wheel.
It now seems that 'diamonds are a Bog's best friend'.
John