Stick on fire exit signs or hard plastic?

[Guest MMad]

I need to purchase additional Fire Exit signage for a block of flats. The current signs a self adhesive but I'll have been informed that I should be using hard plastic which must be screwed to the wall. Could I please ask you to confirm which type I may use?

Thank you for your help.

[AnthonyB]

You are being spun the usual sales rubbish about signs having to be rigid plastic, photoluminescent, etc.

Self adhesive is fine.