Should one give charity locally or sacrifice animal in home country?

I have been living in UK and as per state law, one cannot slaughter animals. Some people send money back to their counties e.g Pakistan. I saw a video of Mufti Menk saying that charity should be given to the country charities in which you reside in. Some people become really patriotic on this subject as they would rather send money to someone who they trust and can distribute accordingly, then some people also start converting money e.g I give to charity which is doing 50£ for a portion of cow, however one relative told in Pakistan it is xxx amount which converts into 130£ but it is same portion of cow. Should one give to charity or to siblings in Muslim county who can do the sunnah?