Re: Tea with milk
You can get both sorts in Ireland due to dominance of UK wholesale and retail. I guess after March the choice will be Lipton's from Poland, Barry's and maybe Lyon's
Bewley's too. Punjana (Thompson's) is Northern Irish (making it obviously superior), it'll probably be possible to smuggle past the magical Brexit fairies. Of course, none of it is actually grown on either island (or in Poland for that matter).