My recommendation would be to get a Marlin in 30-30 and get leverrevolution if you intend to shoot deer with it.
The 45-70 is obnoxious to shoot and won’t make legal requirements north of the border with most ammo.
If you want one for plinking or club/gallery - go 44 mag - easier to load and has the competitive edge over a 357.
You have to love a lever gun - I’ve owned them in 30-30 (marlin 336) in .22 (marlin and Winchester) .22 mag (Winchester) .357 (marlin) and .44 (marlin)
I currently have 3 marlins (.22, 357 and 44)
Edit - just noticed you are in Scotland - even more reason to go 30-30 if it’s for deer - and if you are up in the Aberdeenshire direction and want to shoot my 3 drop me a PM and I can arrange it.
Regards,
Gixer