I'vee worked in a few premier inns. I've stayed in them and the beds are pretty comfy. However for a 'budget' hotel they are actually pretty expensive!
They have this thing where if U book more than 3 weeks in advance its only £21 for the room... Altho I doubt they would have that offer for any of the London ones. Would be worth a look on line tho.
Also, U know the advert with Lenny Henry, he says good night guaranteed? That's because if you make it a complaint they can offer ur money back. Not saying you should complain for no reason lol, but if there's w problem I would!
This one wee woman did it about 9 times in different premier inns, so obvious she was at it but they still gave her her money back every time :s