I have been trawling the internet to see if I can find in the way of info about BA's E-Jets.
I came across a news release from Embraer which says the E190's max range from LCY will be 800nm
Embraer - Empresa Brasileira de Aeronáutica S.A.
The E170's range is 750nm with a full load
Embraer Commercial Jets
Which is much further than I expected.