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This particular wheelset from your £1800 bike, but they're also available on the £1200 Claris model
https://www.specialized.com/gb/en/diverge-e5/p/199973
https://www.bespokecycling.com/bike-selector/products/specialized-diverge-e5The buyer wouldn't get any sort of warranty on these as they weren't the original purchaser.
Specialized don't spec a wheelset that's worth anywhere near £240 (+£35 for the rotors) on a bike with 8 speed Claris, and overly optimistic pricing tends to struggle here vs, say, eBay.
Anyway, GLWS...
The price that you say is what I’ve seen for well used wheels and without the rotors. These have been used a handful of times so they’re are practically new, hence the price.
Also, to correct you, these are from the £1800 E5 Elite Diverge, they are not the Axis Sport which are the lower range.
As I said, price is negotiable. Are you interested?