What cup holder would be compatible with this stroller please?
There is no dedicated cup holder as far as I know, so I would personally go for any universal one. Something from Diono, for example, but there are plenty of brands depending on which country you are in, so just a visit to any baby store and asking for a universal cup holder is enough.
A little tip - don't get the cheapest one; they are usually really flimsy. Look for better brands and pay those 10 extra for comfortable use.