Depends on area/manager but ours has cracked down on none natural colours.
I had it pink the blue never say anything about it
If you have coloured hair. Visible tattoos. Piercings. Forget it.
I was employed with all these things on the table and was told it was no issue until new management took over and expected me to change my appearance after being employed for years with no issues
I guess any colour
Natural hair colour.
Whatever colour apart from bright colours
You can dye your hair.
No regulations against hair colour to my knowledge
Natural hair colour