If you are contemplating booking a hotel stay, Hotels.com has a decent flash sale which is worth considering.

It is valid for the UK site only, and full terms and conditions are available here.

• Book by September 23
• Stay by April 30, 2022
• Get an extra reward stamp for any hotel booking
• Promo code RWD1921 is needed at check-out

Since you are awarded one extra stamp no matter how long your stay is, the best scenario is for an one-night stay where you earn two rewards stamps in total, equal to a 20% rebate roughly.