How long, on average, do the plastic header tank rads. last before they need replacing? Mine is now 5 years old, is it likely to give way any second? Should I buy one of Simons lovely bits of art just in case?
Having watched folks trying to keep a Roadster on the road one Drive-It-Day, I changed mine as soon as the car was out of warranty. I didn’t want the original failing half way up an alp. The nice people at Allon-White said that 4-5 years is typical but that some cars go on for a lot longer without problems.
The reference above to the radiators being the same throughout the range is most likely significant.
For the cost involved in replacement, when compared to a ruined holiday, in your shoes I would bite the bullet and change it before the next major outing.