I don't think killing grey squirrel and minks is a good idea
Grey Squirrels? Most certainly YES, they're nothing but bushy-tailed rats.
I understand they're officially classed as non-native vermin in the UK, so if you should be unfortunate enough to catch one, it's actually illegal to let it go.
i don't think it's right to kill them. If you want to see red squirrels go to the Isle of Wight.
I think we should not kill the grey squirrels, they do not harm us. I agree they are helping to cause extinction of red squirrels, however, they are not "killing the red squirrels" as you seem to think; the grey squirrels are simply more succesful, and have adapted better. KIlling them would be cruel and unkind.
Maybe this link would be of interest to you.Believe it or not,in the grounds of Stormount Castle (Belfast) Red and Grey squirrels live in harmony!