I don't think displaying more information will make the process any easier. Quite the contrary, you will have an overcrowded screen where locations are still difficult to find.
I would instead consider a more straightforward way of filtering locations. It could be an input field where the user can write a location and it filters the results live... or a map... or since you have all that empty space on the right you could have the location there (street name? town? depends):
I'd definitely NOT show the expander for all the results. I would try to add functionality to facilitate some sort of search.
A user can either look for a location close to their home, in that case they could do a search for postcode (most people know their own postcode). If they are looking for a location on some other area, they can instead input an address, or a neighborhood. Or if this is mobile, you can even pull a GPS location (dreaming here) and show the distance to the nearest centers ;)