Thanks for that Graham,
My supplier finally got back to me with a confirmation that he has a box of left hand ones and two right hand ones but wants to keep those as they fit his Keiser boring bars
So I brought a box for myself from your Fleabay source
I seem to recall Nigel Kelley sold those tips for £7 each when he went to the Model Engineering show back in the early 90's which is why I only purchased 2 tips at the time: I now have 19 spares
Jo