IN
They haven't then suggested that the original GWR have in some way infringed upon their trademark though, have they? What First have trademarked is the (First) GWR logo, nothing else. Anybody is free to use the GWR name given that it has long lapsed (if it was ever registered to start with!). Any attempt to enforce such a trademark would probably result in its registration being thrown out.
ITV aren't trying to have it both ways. You either care about a trademark, and renew it, or you don't. It's that simple. Those trademarks are "dead", meaning they're effectively free for anybody else to use - but not register.
Going back to the original point, there are countless examples outside of the media world of an unrelated business taking on a brand name recognised as originally belonging to another business within the same sector, and being able to do that because the original trademark has lapsed either by registration, by lack of active use, or both. Going back again to train companies, First Great Western has just rebranded as GWR, irrespective of the fact that First Group has absolutely no connection with the original GWR.
Similarly, given that ITV plc have abandoned all of the brand names that the original regional stations used to trade under (with some not even getting continued acknowledgement in regional news titles), they cannot have it both ways and also prevent anyone else from ever re-using those names if they allow any trademark registrations that might still exist to lapse when they are no longer actively using the trademarks. Media is not an industry with separate rules.
ITV aren't trying to have it both ways. You either care about a trademark, and renew it, or you don't. It's that simple. Those trademarks are "dead", meaning they're effectively free for anybody else to use - but not register.