Pleiades,
I think you are right !, thanks for the nudge in the right direction.
I had been hunting on E-Bay and Google but not on automotive restoration spares sites....which is why I was just seeing the ones for 1.6mm plate pop up all over E-Bay. There are a few places I used when i restored a mini a while back, I�ll start with those.
I would respond to your quip about Wallace, but the versions of chrome and firefox I'm using on my phone are difficult to use -
"It's the wrong browsers Grommit !"
sorry, I couldn't resist either