Thanks for your reply.
Radiator can be bought for less than£100 - would you just get a 3rd party one?
"In either case, your car will now be viewed as a dog to future buyers given the issues were reported in the service report."
Apparently, a prospective new buyer cannot just call up Lexus and ask about the past service history of a car they don't yet own due to data protection. How enforceable this is I don't know.
When selling on, most private sellers/dealers, will just hand over the fully stamped service book minus all the other problematic service reports.