The advice I’ve read (and implemented myself) is to not so much run a block list, but an allow list. So first things first, have a rule to block all connections, then have overriding rules to allow connections using criteria you would deem safe. If you know someone needs to access the server from the UK, include the UK on the allow list. Everything else can remain locked down until you have a reason to open it up to another country.
The advice I’ve read (and implemented myself) is to not so much run a block list, but an allow list. So first things first, have a rule to block all connections, then have overriding rules to allow connections using criteria you would deem safe. If you know someone needs to access the server from the UK, include the UK on the allow list. Everything else can remain locked down until you have a reason to open it up to another country.