Hi San Francisco
I wouldn't catagorise her sounds as Merseybeat, noting like in fact this is due to reasons of geography, era, influence:
Shes from London in the south of england some 200 or so miles from liverpool, her sounds is more reminicent of the 1950's then the 60's, and her influences are very diffrent mersybeat was more influenced by Chuck Berry, Elvis, Buddy Holly etc
AW's, at the present time at least I belive are more the Ronnets, shangrilas, Mowtown and in general etc (Im no expert in this thougth)
I think there is a backlash to the manufacured and sugar coated pop dross that is is so prevalent these days and about time to.
England, Scotland, Wales and Norther Ireland constitute the British Isles, hence there peoples are British, in the same way your american also californian.
A lot of people still do think of them selves as Scots, Welsh, Irish first and then perhaps British afterward, but what can you expect from a buch of Celts .
sorry just my little atempt at humour.