Two books (actually one book and one novella) in Ilona Andrews' Innkeeper series have dropped to £0.99 each at Kindle UK, possibly but not certainly as part of the new monthly sale.
Sweep in Peace, #2
Kindle UK:
https://www.amazon.co.uk/dp/B016WQUTTM
Sweep with Me, #5
Kindle UK:
https://www.amazon.co.uk/dp/B082TVGFPW