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@4_bathrooms wrote:

This thread might be useful (I replied to the wrong thread initially).

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This is the reply I intended to post here:

It seems PayPal make a "small charge" whenever a credit or debit card is edited or added to the account; this is just to obtain a "pre-authorisation" hold to confirm the card can be used for online payments - the sum is never actually collected. In PayPal UK's guidance it is stated that £1.00 will be debited from a card that is being "confirmed" and the sum(s) will be refunded once the (last) 4 digit PayPal reference number is confirmed.

My guess is it is one of these confirmation methods that is being used by PayPal.