If you are living overseas and don't have a local UK MP to write to (or even if you do) the head sadist D. Cameron MP directly? It's easy and goes straight to No. 10 https://email.number10.gov.uk/
I think it is about time folks opting out of living in the UK (England) kept their noses out of UK affairs. If you have opted to forsake the UK for all the usual reasons and now live in Spain then deal with animal rights stuff in your immediate sphere of influence. You want your cake and eat it.