Damien,
I picked up a Peltor 8006 second hand off Ebay for £100 + postage. It's a hell of a lot more comfortable than the head-clampers I used to borrow from the flying school (which looked extremely similar to the link you suggested).
After an hour wearing that ASA set or the Pooleys budget equivalent, I frequently had a headache and sore ears not long after takeoff and would have to fold my ears back to their original shape in the car on the way home.
However after taking the Peltor off, after a few minutes I wouldn't know I'd been wearing it. Worth considering, if you can stretch your budget slightly.