[Elcie]

Ah, I have seen those but didn't know what it was called.  I think she is pretty experienced in eggs and her husband was a chicken keeper.  She was really lovely about it and even apologised for telling me when she saw me later in the day.  I haven't noticed any problems with the girls and have kept my eye on them more than usual this week, but the flubenvet will sort them out anyway so hopefully if it is an infestation then this will stop it getting worse and solve the problem.

[OpiumEater]

however it is perfectly possible to get worms in an egg if the hen has an infestation 

No way!!!