Thanks to all of the posts here I went into the job expecting having to jack the car up and have loads of trouble. I had everything ready for the worse case scenario, but thankfully I didn't need any of it. I didn't even need any tools.

Once located, we disconnected the cable and set about finding the dreaded pin. After a couple of minutes we found the pin and it was different that expected, it more of a retaining pin with outside metal retaining arm. With a little wiggle it came out without any problems, I almost couldn't believe how easy it was. Removing the sensor was just the same, a quick wiggle and gentle upward pressure and out it came. We oils up the new one and inserted, and the hardest part followed, putting the pin back in. It was a case of time and trial and error to line the holes up. Taking into account we did this from the top of the engine, used no tools, and took only 20 mind, I was really happy. I guess I have been lucky.

My speedo now works fine.

Just want to say a big thank you to maker of the vid and all the postings with their stories and advice, it really helped me and made what we expected to be a bugger to be simple.

Thanks Everyone