Hi Stig,
I quite agree. My first thought was C.1400/16. Hopefully not too coloured by the fact that I've already seen photos of C1401/16 and C.1402/16. It doesn't look like either of those two, but then it wouldn't necessarily as both of those photos show the machines in front line service and the possibility of a change in appearance can't be ruled out. Fingers crossed the seller posts a further image.
Regards,
Clint