Ok, so it looks like they're using the B&M fat seats on Nemesis Inferno as a "new" selling point.
http://www.londonnet.co.uk/news/2011/sep/thorpe-park-builds-rolly-polly-coaster-overweight.html
I'm no expert on Thorpe, but I'm fairly certain they haven't "added" new seats to Inferno at all?
THORPE PARK has increased the size of its rollercoaster seats to cater for the larger customer.
The Surrey theme park's Nemesis Inferno attraction now has specially-designed super-size seats after so many people had to be turned away from the ride because they were too overweight to fit on it.
"The reality is that we are super-sizing - and that's a fact we're embracing," said Mike Vallis, Divisional Director at Thorpe Park.
"Why shouldn't people be comfortable when they are enjoying a day out with their friends or family?"
Visitors with a chest size of over 51 inches are asked, via a sign, to queue for the new jumbo seats, which feature two buckle straps instead of the usual one.
Thorpe Park plans to introduce super-size seats on its other rides in the coming months.
http://www.londonnet.co.uk/news/2011/sep/thorpe-park-builds-rolly-polly-coaster-overweight.html
I'm no expert on Thorpe, but I'm fairly certain they haven't "added" new seats to Inferno at all?