The sort code 20-59-97 relates to Barclays Bank in Wingrove, Newcastle Upon Tyne.
However, I can not find a branch of Barclays Bank in Wingrove, which makes me think this may be a business address, rather than the address of a publicly accessible Barclays branch.
The full address given for the sort code you requested is:
Barclays Bank PLC
Newcastle U Tyne
Maybe if you contact Barclays, they will be able to help further, but I have checked various sources and that's what I get every time. There certainly are branches in Newcastle, but if there is one in Wingrove, it is not showing on the Barclays branch locator.
Perhaps it is a business address, rather than a Barclays branch.
I'm assuming that letters addressed to the address given would get to the correct department though.
I hope I have helped a little, banks can be so confusing at times!