Making a brief comeback to amp-f (yeah, sometimes I miss reading/posting). . .
To my best knowledge John probably refers to John Bull (e.g. as in 'John Bull and Uncle Sam'

. Britain?
You're not from Europe, are you? Maggie is Maggie (aka Margaret Thatcher), 'notorious' Prime Minister of Great Britain and Northern Ireland in the 80s. Btw, she has just recovered from a stroke she suffered in December.
No and no.
HTH,
regards,