cymatty, in my opinion you're crazy to consider a 1hr commute but not a house share. I share my place with one other and it's only a good thing - cheaper rent, bills in half, we share cooking and cleaning, good company... there simply isn't a downside. Professional shares are nothing like student shares if that's what you’re worried about.
Get in touch with theDude - his set up sounds good.
No I understand what you are saying about flat shares and can see the benefits, but I have a girlfriend who will probably want to come down quite often and friends etc that may pop down and I would rather do it in my own place.

Regarding the commute my longest commute was 1hr 40 mins each way currently it takes between 1hr and 1hr 20, so it does not really bother me.
The property would have to be cheaper though to include travel costs.
