The eShop automatically handles UK bank holidays. However, if you close your business for holidays or any other reason you can set up custom holiday dates.
It is important that you set your forthcoming holidays at least two weeks before they start to ensure that customers do not book fittings on those dates in advance.
Adding custom holidays allows your business to still receive orders, however the days specified will be excluded when customers are choosing their booking date.
To add a custom holiday within your admin go to Settings --> Custom Holidays
For further assistance with this please contact firstname.lastname@example.org