EasyJet do let existing crew who only speak English to transfer to their European bases (except for Geneva which is run as a seperate entity) but it'd seem that new entrants have to be fluent in the language of the country in which they wish to be based.
However I'd imagine they'll be recruiting shortly again for LGW (if not other bases as well) because there's several new routes being launched in the next few months and the turnover of staff there is as high as ever, so perhaps get them to get in touch with you when they do begin recruiting again or failing that just keep your ear to the ground!