No check on my last LNER journeys (York to London / Peterborough to York), which is not uncommon.
Avanti/WMT checks are rare, especially the latter and in particular on their "LNR" branded services; I've done journeys such as Stafford to Euston without any checks.
I once did Stafford to a suburban Glasgow station taking three Avanti trains (back when you had to change at Crewe and Preston) in 1st class with no check on any of them, however the Scotrail on board ticket inspector did a check before my final train had even pulled out of Glasgow Central!
Avanti/WMT checks are rare, especially the latter and in particular on their "LNR" branded services; I've done journeys such as Stafford to Euston without any checks.
I once did Stafford to a suburban Glasgow station taking three Avanti trains (back when you had to change at Crewe and Preston) in 1st class with no check on any of them, however the Scotrail on board ticket inspector did a check before my final train had even pulled out of Glasgow Central!
I suspect not on Hull Trains, as they do actually check!Selby to Kings X probably longest...