Place your bets on which type of LED they'll go for... warm and subtle or football stadium?
Judging on the current lighting, and our shared experience of reality, XCs inability to do anything well at all indicates that it will be a jumble of both.
Any new lighting will require a complete top to bottom clean, as the CFLs/candles they currently use do them a favour in hiding the accumulated presumably Virgin-era filth.
Possibly a regular maintenance issue but it seems that every other Voyager seems to have a busted window that's condensed up. The one today was greenish with mould - presumably I'm mistaken and this is a spectacular commitment to the environment by growing their very own ecosystem.
XCs biggest problem is they don't go to London nor do they belong regionally. They're the ugly duckling that has no status or belonging, a sprawl of mediocrity that can be tolerated as they're usually counterbalanced by a reasonable operator nearby. If they had one service to London, or if they belonged geographically, they'd be getting 80Xs.