Hi Cameron,
Thanks for getting back to me. To answer your question, I proceeded to make a stuck disc repair closely following the if I it guide and studying the photos in detail. After doing a ram upgrade three weeks ago with complete success I felt confident to make this disc repair, which went without any problems or so I thought.
I'm not aware of damaging anything and apart from finding it difficult to replace the large ribbon that needs to be aligned before pressing down I thought everything went well. On powering up everything was working but when going on the Internet I got a message " no WiFi " or Bluetooth " I have since gone back in the Mac and went over everything but couldn't find and mistakes or damage. Not sure where to look next, don't feel confident enough to check the Airport card so may have to taken it to my local Mac tech for a look. Regards Peter.