Was it a CD and if so, how much did you pay?
I've seen it online to pre-order for Β£24.99 which seems excessive.
EDIT - a bit more nosing around and it seems to be Β£13.99 in hmv:
https://hmv.com/store/music/cd/songs-of-a-lost-world
This is the logical way to do it from an automated perspective however, a chilly nip overnight could well be overcome when the sun rises around the time you get up in the morning. Knowing the temperature will rise naturally allows you to override the heating controller and save some $$$.