Its tricky, I've been riding bigger and bigger frames realising that I'd been riding the 'wrong' size for a very long time.
The Elswick is a large 62cm but its fits very well as long as I keep the Gentleman's Relish out of the way
The DS is a slightly squarer 62cm but works with the current stem and quite a bit of seatpost showing, it now deserves some better shifting
The Caygill is 'small' compared to the rest but needed a shorter stem to make it comfortable.
The Hill is quite modern in its behaviour on the road and would also benefit from better shifting, another 'big' frame with a long stem but still comfortable.