Hmmm, I've just been investigating loft ladders. I have two problems.
1, the existing hatch is only about 8 inches from the wall, so the ladder needs to sit entirely on the hatch or only overhang by 8 inches or less.
2, the existing hatch is not long enough to accept this type of ladder unless it is a telescopic type.
3, the telescopic ones are silly prices.
Oh yeah, that's three.