Someone (more often than not American) who holds an extremely romanticised view of England and the English. Can be found putting on an Dick Van Dyke-esque English accent and saying things like 'fag'.
a) someone who wants to have sex with a British person. This desire to fuck British people is usually due to the dreamy British accent.
b) may also refer to someone who wants to have sex with an Australian because Americans often can't tell the difference between the accents.
person A: I really wanna have a threesome with Hugh Grant and Hugh Laurie
person B: that's cuz you're a total anglophiliac... and possibly a Hughophile.