Yes GTR seem much more reasonable. About the 1st class rate for other journeys, I found out that legally without hard proof such as CCTV, Recordings, my own admission and/or Inspector Note etc, they cannot charge me 1st class rate for all journeys, as assumption based on past journeys is apparently not valid evidence. Even then, the burden of proof falls on them and unless they took me to court, it would be alot of effort to find CCTV footage so I don‘t think they would bother. I’m not 100% sure if that is all true but thats what I found out. Thank you letting me know about Thameslink train, I’ll be sure to keep an eye out! My train is normally Greater Northern but its good to know this.