I dont like the new layout for picking seats on the nufc.co.uk site, looks cheap, the old one was MUCH better.
I've found that when you pick seats that are supposed to be aisle seats, you get there and you're not on the end of a row. I go with a mate when I go to home games (only a couple a season, mainly go to away games) that's about 6ft8" tall so he needs the aisle to get his legs out. I usually phone the box office now to make sure. Not sure if they've sorted that now.