I find the same Chris, whenever I’ve rasied prices by a pound, I’ve never had anyone question it, and i don’t let them know, I simply put the new price on the ticket.
I haven’t got all my customers contact details, so wouldn’t be able to text or email them all anyway.
I have a great relationship with my customers, if they’re in, than I say ‘just to let you know it’s going up a pound’ but if no one is in, it’s just written on the ticket.