Once you get within 3-4 weeks the prices will rise no matter what. It’s best to plan 6 weeks in advance or more. Given your current situation I’d look at Sunday night hotels as those will be the cheapest.
I would look around for a hotel on the Friday. Saturday is a peak day and looking last minute means the hotels won’t be sub-£30.
I need a cheap hotel near Alton Towers for either the Friday 27th or Saturday the 28 Septemberplease
Any deals for Whitstable in Kent end of Sept/start of Oct?
It's not a book. It's supposed to save time by allowing you to search for the hotel you want and then see the dates that are under the promotion (as opposed to searching every date for that hotel on the main website).