Reddit mentions of BattleTech Legends: Wolves on the Border

Sounds like you've gotten covered on the Tabletop wargame aspect of things so let me give you some book recommendations.
I'll link amazon UK stuff since that's where you are.

First off, The Warrior Trilogy. It's about the 4th succession war & events leading up to it. I'm only seeing Kindle version on Amazon UK but it is in print again so you might be able to find paperback copies somewhere if you prefer that. I found paperbacks I bought for a friend on Amazon US.
This is my personal recommendation for a starting point.

https://www.amazon.co.uk/gp/product/B071992LLM/ref=series_rw_dp_sw

The Grey Death Saga is highly touted, though I'm loathe to admit I haven't read this one. Need to fix that. The individual books appear to be available on Amazon UK but the reading order isn't terribly obvious so I found this site which lists [& sells] them:

https://www.thriftbooks.com/series/saga-of-the-grey-death-legion/39093/

Wolves on the Border is about one of the major Mercenary Units & their dealings with the Draconis Combine whom aren't very friendly towards mercs in general. I enjoyed this one, along with "Wolf Pack" which is about a civil war within the same unit ~30 or so years after the events of "Wolves on the Border."
Don't read Wolf Pack before the next one though, because timelines.

This will be the last recommendation I make right now. Though there are many other good books, these will get you started on the book lore.

The Blood of Kerensky trilogy.
https://www.amazon.co.uk/gp/product/B071992LLM/ref=series_rw_dp_sw

It's about the Clan Invasion of the Inner Sphere told mainly from the perspective of Clan Wolf. I'd recommend reading The Warrior Trilogy before this one because spoilers about certain events that happen in that.

pick up "wolfs at the border". that book should help you get into BattleTech

https://www.amazon.com/dp/B003TFESVA/ref=dp-kindle-redirect?_encoding=UTF8&btkr=1