On 3 Mar, 08:16, Phil Richards wrote:

We have two spare Oyster cards at home which we top up & lend to friends
and family when they come down to stop with us.

This makes a lot of sense. I've given my sister an Oyster Prepay that
I wasn't using so that she can save money and time by topping up at
Kings Cross when she's in town. The alternative would be a huge queue
and ridiculous prices.