To slightly go off topic, I use SkyDemon for by VFRing from Redhill but when I've flown in the USA have used Foreflight. Even used it for creating flight plans in the mountainy bits of Colorado.
I don't have a current Foreflight subscription as I haven't been there for 18 months but I know they now include the Europe and the UK.
Has anybody tried it ? If I do go back to flying in the US of A and need a Foreflight, would it be worth adding the UK maps as well ?