Do I need to send my test scores right after sending my app? Or do I wait for them to email me?

I applied for my colleges thru UCAS on Oct. And I’m confused… some colleges personally ask me (i.e KCL) to send them my test scores. Whereas, some schools don’t email me at all. Do I need to send my test scores right after sending in my UCAS app? Like US schools? Or should I just wait for them to email me?