The HSS▸ services I used are Bath-London and occasionally Cardiff-London and these services are almost always unchecked. West of Tauton, I have insufficient data to comment on high or low speed services.
Is this in First or Standard? My experience is First is regularly checked, and rightly so, and Standard not as much especially with most
IC▸ stations having gatelines.
Which shows the fallacy of the attitude that many
TMs‡ have, given there are hundreds of ways to get on the train without passing through a gateline.