Bathroom ceiling same colour as walls?

danrv

I think I’ll do the ceiling in white. 
Bought a few testers for the walls. Haven’t put a lot on but gives some idea.
Egyptian Cotton near the architrave and Polished Pebble.
Natural Hessian looked a tad pink.
As mentioned, it’s deceiving and can turn out darker that expected, especially after a couple of coats.
It’s an East facing room and gets sunlight until early evening. Maybe a cool colour would work best as suggested by Dulux.

danrv

All done.
White Zinsser paint for ceiling and Dulux Egyptian Cotton on the walls.
Managed to get a quite a good line along the join. Regular blue masking tape from Homebase did pull a tiny bit of the ceiling paint away.
Have bought some Frog tape as suggested earlier.
Thanks for the replies.