noriek2003 - Thanks for the idea mate, worked a treat. I doubt we would've got it done in situ otherwise!
Bob - Much appreciated mate, how much do you want for it? If you fancy bud send me a PM and I'll sort out payment (PayPal ok?).
For future reference to help anyone who might be a little confused, I managed to get a rather good shot of the offending Bastard Bolt (pictured below, the bolt nearest the bottom of the picture);
The cylinder on the left is the speedo sensor. You can find this part of the car directly under the plenum (inlet manifold).