They provide a link to a form to object to this processing:
https://www.facebook.com/help/contact/6359191084165019
It asks the these two questions:
Please tell us how this processing impacts you. (Required)
Please provide any additional information that could help us review your objection. (Optional)
On what grounds can I object?
Apart from that, forget about it and go off grid and accept that you have been a muppet!
Do people not think about the future, take responsibility or consider the consequences of their actions.
Like sharing all that data in the first place!
UK?
I much doubt that would wash.
Report to the ICO.