You can now book them all year!
I've just booked 2 nights at a travelodge on a family room at Heathrow, end of March (ready for Legoland opening) for £20.
Also booked 2 nights (one night on the way there, one on the way back) at a travelodge at Chieveley Aug/Sept, for when we go on our hols down to Devon, again £10 per night!
BARGAIN!