Unfortunately you can't try before you buy (subscribe to) an internet connection from (I think) any ISP
You can get FTTC on 1-month contracts from some ISPs. Of course, there will almost certainly be an up-front installation cost - to cover the costs the ISP themselves have to pay, which are normally amortized over a 12-24 month contract. But it's certainly doable.
Check the expected performance at broadbandchecker.btwholesale.com (address tab). This uses existing FTTC measurements and/or a computer model of the line length to estimate speeds.
If you get an FTTC connection which is close to the 80M down / 20M up maximum, it will be very usable on its own. TV streams which are not 4K/UHD are only 5-10Mbps. Games *playing* uses little bandwidth. Games *downloading* will fill the pipe, but that doesn't mean things like Teams won't work, and in any case you just make it a rule that new games are only downloaded overnight.
If limited bandwidth does turn out to be a problem, then you can split your network: two different routers with their own wifi SSIDs.
- FTTC for business/work use
- a separate connection for entertainment - which could be 4G/5G or Starlink.
So if it were me: I'd start with the FTTC (on a good provider with a 12+ month contract), and add the other option if it became necessary.
I'd also try 4G/5G before Starlink; if there's a good signal from one of the three networks then it will be cheaper, and will use less power, than Starlink.
If none of those options work, then Starlink is the fallback.