@SunshineNCoastlines I suggest setting up your favourite searches in the app not the website as you get instant notifications to your mobile device when a new sit gets listed in your search parametres. When you do your whole of UK search, you can then filter by from/to dates and the type of pets you want to look after. You have to save this search & name it something meaningful for you. You need to have the app notiifications switched on in your device settings to be notified when a new sit is listed that fits your saved search parametres.
You can find most answers to your app & website quesions on THS help & support by using the looking glass to search. Here’s an article I found
You can also get similar help from historic forum threads the same way using the looking glass above. Here are 2 threads I found.