B757 can use almost all of the T3 stands, with the exception of those across the front of the T1 building, but they're not wide-bodied aircraft as such.
I've seen B767s of both BA and, on occasion, AA parked on stands 42-44, while stands 52-54 are regularly used for B767 and have been used for A300, A330, B747 and B777.
I'm also fairly sure that stand 49 could be pressed into service for a wide-bodied type so long as the stands to either side were empty.
That gives 6 or 7 stands that can be used for wide-bodied aircraft, with several other stands suitable for B757.
Like I said, many more than 5.