well i would be very surpirsed if they weren't allowed.
the seats comply with EU and UK VOSA road safety reg's and are fine for us adults so can't see why not.
don't take my word for it but i would be very surpirsed if they were not aloud.
SO many car's have bucket seats now from manufacture. golf GTI, Vauxhall VXR, FOcus st and RS seen plenty of people with kids in these seats..
you can always call recaro themselves ???