Just to tidy this thread up.
My new release bearing arrived this afternoon.
Here's a picture of the two bearings side by side, may be of use to others at a later date.
The standard Sierra bearing is on the left ( CCT132 ) & the Capri bearing is on the right ( CCT133 ) . Both are QH part numbers.
It can be seen that the CCT133 bearing is about 10mm thicker & will allow enough throw on the Zetec clutch
Not the cheapest of bearings at £26.93 but needs must & all that
They managed to get the part in direct from QH stock & was a next day service.
This was also the factor that I used to obtain my Maxi & transit joints, I seem to remember that the prices for them was quite good
Anyway folks, that's me sorted & all is good with the world once more