It's not just a pound, but yet another pound, if you could buy a single and twin cheaper than a triple, then the triple should have been reduced, not prices put up. £1 on top of £8 is quite a % rise.
It doesn't worry me, I use gg4 (works out a fraction of the cost) I'm surprised that it's gone up already, if I recall the price was set to help overcome the investment and developement costs.....
Darran