Did holiday prices just go up??

[Chchchchanging]

Last week was looking at holidays, typically c£1500 AI
Went online last night determined to book something after a dire weekend in serious need of something positive to look forwards to... And they're now all at least £1900-2100!!
I'm out of school holidays, no promos were on before, there is plenty of availability
The only thing I can think has changed is that it's half term here now- does that impact booking prices

anything to do with cookies? could you look on another machine/in another browser?

I used to find Tuesdays were the cheapest night to book a holiday. Sundays and Mondays were very expensive.
If you put a holiday on your shortlist on Thomson and First Choice, you can watch the prices go up and down daily.