Bear in mind, fighting the UK would also mean fighting the greater part of the Commonwealth. Granted, the EU has loosened the traditional ties somewhat but if you were planning to do serious harm to the UK I expect you'd have to contend with Australia and Canada, New Zealand and possibly even India given the large number of Indians who currently live here.

Also - with relation to the missiles -

"One drawback of the Hs 293 was that after the missile was launched the bomber had to fly in a straight and level path at a set altitude and speed parallel to the target so as to be able to maintain a slant line of sight and it could thus not manoeuvre to evade attacking fighters without aborting the attack"

Basically, German bombers would have been toast again Fleet Air Arm interceptors. Germany never had enough bombers in WWII anyway, the lack of a heavy bomber is why you lost the Battle of Britain.