Artaxerxes
Look out, he's got a gnu!
Brooks are owned by an Italian company so it's not all that surprising that distribution is via Italy. There will be endless cases of this and you can address each one in turn saying 'well why don't we just...', but in total it amounts to 'why don't we just unilaterally opt out of globalisation'. I mean, you can try, but it's what sanctions are supposed to do to a country.
No it's fine, brexit has made no changes to postage or imports and any changes that exist are purely imaginary and not affecting any businesses anyone cares about even if they did theoretically exist which they don't.
Clear?