Have just booked my first flight on easyjet since allocated seating came in - I paid £3 to choose my seat as I wanted to ensure an aisle seat (I was not worried about exit or forward seating and this seemed a small price to pay for the security of getting an aisle seat). If someone choses not to pay for a seat, how does the website allocate a seat, would it allocate the person to a centre seat, on the basis that no one (travelling alone) would ever pay for such a seat?