Before returning home from a stay in the Otter Valley in the van, we went to a restaurant with our friends Simon and Ellie. While waiting for our orders to materialise, I started filling in a contact tracing slip, which was entirely voluntary, as no-one was checking whether patrons did indeed fill them in.
Simon pointed out that, as all payments were now being made using contactless credit/debit card payments, all that was needed to trace patrons who were at the restaurant at a certain time was for the establishment concerned to analyse all the payment records on a certain day between certain times.
There would obviously need to be a link to the banks for the contact details of the owners of the cards to be made available to the authorities responsible for contact tracing, but that doesn't seem like an insurmountable problem - unless there are GDPR issues that make it insurmountable, although I can't really see that as being an issue in a crisis situation.
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