Originally Posted by
kryten22uk
Ah, I see. What added to the confusion was that I booked it on bmibaby.com!

No you didn't. You may have started on bmibaby.com, but you'll have been redirected to the main flybmi.com website to see the available flights and make the booking.
Try making a dummy booking now on the route and look out for the change in site when you do a search for tickets.