This turned out to be a reasonable cash deal...
The shop had a small angle grinder for £20 and a 115mm version for not much more. I already have a cheap 240v 115mm grinder - cost me £15 from CPC ages ago and seems to keep going. I also have a 230mm Hitachi
which was left behind by some workmen who were putting in new gas mains... 'rescued' by a neighbour who then realised he didn't have a use for it so he gave it to the local keeper-of-the-right-tool-for-the-job which is why I have it
Turned out to be 110v which is not a problem since I already have a big yellow transformer thingy which normally runs electronics kit.
It recently ground (
) smoking to a halt - stripped and found a bearing seized and a tooth missing on the drive motor pinion - freed the bearing and cleaned out / re-greased and it lives again !