I think the 757 operates the Toronto route - it does on most days from MAN anyway, with maybe once a week A330.
I think the 757 is fitted for long haul anyway but not 100% sure.
I don't think there will be 4 A330s at Gatwick that day as they will be needed around the country at other bases. 3 seems about right.
Does anybody know the rough placements for a/c this summer?
Thanks.