Thought I would give you a quck update.
My intension was to drop the tranny a bit so I could get access but this was a non-starter (pardon the pun!) I didnt have a spanner big enough to remove the mech fan then I couldnt loosen the exhaust bolts.
I then decided to go at it from the top!
Completely removed the dash so I could get at the transmision tunnel and after removing the gear cable plates I could see the cps. Recip saw in hand I cut a section approx 4" square out then tried to grip the sensor but the damm thing still wouldnt budge.
A bit drastic I know, but I decided to drill the side of the bell housing alongside the cps, I was then able to get a screwdriver in the side of the cps and force it up. Yippeee!! it worked and out it popped.
After feeding the wire/connector through via a piece of string attached to the old wire I fitted the new cps. (I had to use a little copper grease to help it as it was very tight in the hole)
Turned the engine over and she fired up (sigh of relief) but took a while before it would tick over (kept stopping) you could here the card spacer being shreded off then it started to idle ok.
I then repaired the hole with metal putty and replaced the 4" plate.
Everythings back together now and I am sure it runs a heck of a lot better, tickover is 600rpm instead of 900rpm (very strange!)
I would like to thank you all for your input and suggestions they were very much appreciated.
Thanks and Best Wishes,