However having checked it it gives the address of a central office where Barclays want correspondence sent rather than the branch address - it does give the town though.
This looks like a Barclays sort code - they start with 20 - xx -xx. From what I gather call 08457-555-555 (phone banking service of Barclays) and ask for the branch address. If you are filling up a DDR form - it might be worth your while to ask them for their central mailing address.
Find to banks with this sorting code on http.//www.bankers-telenet.com
205377
Barclays Bank Plc
Walthamstow Branch, United Kingdom
High St. 215, E17 7BH Walthamstow (Greater London)
Barclays Bank Plc
Northeast London Business Centre Branch, United Kingdom
High Road 852/858, N17 0EY London Media URL: http://www.bankers-telenet.com Description: Sort Code or Clearing Code Seach