Nationwide UK's preset link to "Pay corporation - Paypal" tries to pay PayPal at Sort Code 20-00-00 and fails.
Trying "Other payment" options leads one to a page to pay by CHAPS (not free). Payment via CHAPS requires PayPal's bank name and address.
However, choosing option to manually input PayPal as the recipient via "Pay corporation - fill details manually" does not require PayPal's bank's name or address, or SWIFT details.
Hope this is useful.
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