W H Smith is a very well-known UK chain of newsagents and bookstores, with branches in many High Streets, and at airports, train stations, hospitals and motorway service areas. Started out way back in the 1800's with kiosks at railways atations.
I can remember using their C-41 colour negative films......like many own-brand films made for shop chains or the "free films" supplied by processing labs, they were probably made by Ferrania or Agfa. Results were OK, nothing special, much the same as any other similar general-purpose consumer film from the time.