The sort-code 07-02-46 belongs to the Nationwide Building Society, but not to a standard branch. 07-02-46 refers to one of the head offices of the Nationwide. The address: Nationwide House, Pipers Way, Swindon, SN38 1 NW.
There is a standard branch of the Nationwide Building Society in Swindon, and it can be found at: 21 The Parade, Swindon, SN1 1BB.
The other two Head Offices of the Nationwide are in Northampton and Bournemouth. Addresses: Kings Park Road, Moulton Park, Northampton, NN3 6NW; Portman House, Richmond Hill, Bournemouth, BH2 6EP.
If you need to contact the Nationwide, their customer service centre can be called on: 0800 30 20 11.