I would like to mention that the below quote in reference to Gatwick Express TOC
National Rail Travel Vouchers are valid for 12 months and you can use them with any UK Train Operating Company (except for the London Underground and Heathrow and Gatwick Express). You can use them when buying tickets at any manned station, and on-board to buy food and drinks from the Foodbar.
is incorrect, as Gatwick Express is not a TOC.
The TOC's name that runs services along London, Brighton, & South Coast Railway metals is actually called
Govia Thameslink Railway.
Think of it in a similar way to the former Glasgow Rangers Football Club, which no longer exists as they went into liquidation back in 2012, when they were caught operating a tax dodging scheme/scam. The present team based at Ibrox is called
Rangers International Football Club, which were formed in 2012 and started out as a brand new team.
The above paragraph should really be in the Football thread in the General Discussion section, so I'll leave it at that.