If you tell the hospital you're having chest pains the first thing they will do is an ECG (From experience)
again, if you go to a cardiology unit or heart institution normally, the first meeting they do with you, they will take your stats i.e BP height weight and ECG. This is all from experience could be different at other places
And to your question, they will do one at A&E if you're complaining of chest pains.

Merry christmas.