Missed hairdressers appointment

[Gettingbysomehow]

Can anyone advice please.
I missed a hairdressers appointment because I had to go into work.
Pretty rubbish of me I know but i did say at the time I can't book now because I don't know what my shifts are but they insisted and said I can always change it.
Now they want the full amount for the missed appointment.
I've looked on the consumer advice pages and it says they have to have informed me of the charge for missed appointments at the time we made the appointment in order to do this. They did no such thng and it was not brought to my attention so I don't see why I should pay if they didn't do this.
Am I right (not morally obviously but legally).

Do they have your card details? If not, yes you should pay, but they can't make you (I suppose they could take you to small claims court, but let's face it, they won't). They will ban you from going there again but if you don't want to go back anyway, you won't mind about that.

Write to them, explain you were not informed and that therefore charges are not legally valid. They might get shitty and harass you but have no legal claim on you plus small claims court isn't cheap for them so they won't sue

Did you just not turn up? Then pay them!

Depends. If you cancelled with enough notice they shouldn't charge you. If you just didn't show up then they couldn't get another client to fill the slot and now they've lost business. Did they take a deposit?