Unfortunately, these new pics aren't enough of an improvement to narrow down the ID. But it's definitely a "long cross", which were issued 1247-1278 (later half of Henry III and beginning of Edward I; the Edward I types still have "HENRICVS REX III" as the obverse legend).
It's IDed enough to move into the British coins forum, however.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis