Edward England, Stocious is just about spot on with his figures. There are guys who commute from Norther Ireland etc on the SH fleet but its difficult for them. 90 minutes is ok just, but in my view anything over an hour is a real pain in the ass. If you are coming from the north the M25, M1, M40 can be almost impossible to judge. Many guys block their work together and stay down.
I was living an hour and 20 mins away and it was acceptable but I did eventually move to live within an hour although the commute was not the motivating factor