It might be worth looking more broadly.
From the Office for National Statistics, via Visit Britain, reporting on the spend of inbound visitors to the UK:
https://www.visitbritain.org/latest-monthly-data
The likelihood is that the better exchange rate (for inbound visitors) has helped this.
The East Coast Main Line links the biggest inbound tourist gateway (London) with major other tourist destinations, including York and Edinburgh.
What has Virgin Trains East Coast done to actively market to these overseas visitors, and how might the new website and general marketing, with its 'Waheys' and its 'Ooh Awkwards' and myriad other examples of impenetrable colloquialisms and the vernacular, help non-native English speakers feel comfortable and encourage them to book and travel?
Or, alternatively, they could go to ba.com, have the website (or a simplified version) presented in their own language, fly to Edinburgh for £39 and miss out York.
If the best is to be made of the ECML, then surely all opportunities should be maximised. Critically, though, the opportunities must be identified and, as others here have observed, that does not appear to have been Virgin Trains East Coast's strategy.