we have a couple of those in the van a lot cheaper from ebaySuspect this is the cup holder referred to @ £8.99: http://www.taxi-mart.co.uk/shop2/Drivers-Essentials/Cup-Holders/c-1-78-501/
My imagination is fine thanks and I find mine very useful indeed. Fits perfectly on my right hand side and easy to reach. Very firm hold on any size cup or can.I see so not specific to a taxi but a universal cup holder. I am a little more imaginative than that and I don't think anyone who has an X250 cab would find that usefull even if there was a suitable place to screw it.
Mine will involve no screws or adhesive and easily mounted and dismounted and hold two cups