Thank you both for your help and I am very grateful. I have bought the mini screwdriver kit so no more rip off from my local Lexus dealer. At least in this area.
I see charging almost 8 times its worth for an item in these cicumstances as thinly veiled theft.
I have been worried about this type of practice which is why I posted the query as to whether I should continue to have the Lexus dealer serviced in view of its age. I am sure my local dealer will charge similarly outrageous amounts for servicing which I wish to avoid if possible.
I have two major probelms in life: The first is I like nice things, the second is I'm skint.