Yes, it was a victim of unfortunate timing really as the European sleeper network was in massive decline at the time as the budget short haul flight era started.
The UK▸ domestic sleeper service didn’t really alter very much with the Plymouth/Poole to Scotland service being the only casualty in that period IIRC▸ . Though of course the UK sleeper network was much more extensive up until the 70s when the motorway network started to bite into that traditional market.
Fast forward to today, and there are signs that the sleeper services within Europe are starting to regain momentum. Whether we’ll ever see any overnight trains from London or elsewhere in the UK to Europe is far from certain, but is getting more likely as time passes.
What do you think makes it more likely? Where's the evidence of demand for overnight train services to Europe? Which destinations do you have in mind?
Business travel is likely to contract even further, and whilst there may be a leisure market, it's likely to be highly seasonal, and the further the journey by rail, the more a much quicker (and likely cheaper) flight appeals?