I wasn't feeling sufficiently confident to tackle the air bag but having seen the task in photos, I sent the list of parts to my dealers and asked them to fit the switch during the next scheduled service. Either they ordered the wrong part number for the steering wheel cover, or the number is listed here incorrectly since the item which arrived didn't have the hole in it for the switch to pass through. This is an easily solved minor glitch. The point is, I now have fully functional cruise control. Thanks for the useful information OP. For those of you in UK who may be interested, I had the work done at Lexus Hatfield. The chap who dealt with my enquiry can be contacted on [email protected] This isn't the first time that Lookers have helped me out with out of the ordinary work requests with retro fitting option parts and I can thoroughly recommend them.