When I play England I can often manage to get a treaty with Russia to let me have Norway. Moving Fleet-edi or F-london to get it from the North Sea is ok, but then it is harder to attack Sweden and/or Denmark.
My advice is to convoy over to Norway. To do this simply in you first move do A Liverpool to Yorkshire.
Yorkshire is also a key place for the British defense. If France or Germany get a fleet into the North Sea, they could convoy into Yorkshire. From there that army has access to all three centers. The ememy could also have the army support navy north sea into Edingburgh or London.
Matt