But of course you don't need an app and as some have said apps are available if needed.
From the BBC site:
Music should be kept quiet and customers encouraged to order through apps, under updated guidance for businesses reopening from 4 July.
There is also advice to reconfigure seating, minimise self-service, cancel live acts and stagger arrivals.
Places like pubs, restaurants, hotels and hairdressers are asked to keep a temporary record of customers and visitors for 21 days, to support the test and trace system.
Customers will be encouraged to book in advance and order food and drink direct to their tables through a smartphone app.
No mention of COMPULSORY