Leeds 65:
It's not legal to give a sh1tty reference. The worst they can do is say you worked there and then left, and as for "flagging you up" as a future passenger? What are you going on about? What would they do? Offload you? Beat you up? Don't be so ridiculous.
VJW: Interesting point that, but remember you SHOULD tell your licensing CAA if you are off sick for 21 or more days.