What is the best practice for grounding a shielded cat 7 ethernet cable?

I'm in the process of ducting the aforementioned cable through a conduit that I've "trenched" between my house and my office which is in an outbuilding 30m away.

Since buying the cable and starting this project I've learnt about the worries of lightning strikes and ground loops, but I don't fully understand what I should be doing to mitigate these issues.

I'm in the UK (where we have three-prong mains sockets that TEND to have an earth wire connected), and plan to put an rj45 faceplate on each end of the cable. In the house I will connect my router (or maybe a switch if I'm running short of router ethernet ports) and in the office I'll connect a second router (with DHCP off, running just as an access point).

Firstly I don't even know how you ground a cat 7 cable. Do you have to connect all of the shieldings together somehow, or is that what the drain wire does?

Am I right in thinking that I should be earthing one end of the cable, and very definitely NOT the other? How do I go about doing this? And does it make more sense to ground the house end or the outbuilding end?

Any help appreciated… I've spent more time than I care to admit digging a trench and drilling through stone walls, and have spent £200+ on the access point, 40m of cable, various tools, etc etc.

Should I be aborting the ethernet and running fibre instead? If so what does that look like, cost wise, for a 40m run with converters at both end? Is fibre "easy" to set up, just plug and play, or is it a steep learning curve?

Thank you, all help appreciated!