" The only question mark is that recently there has been a focus on heart massage over artificial respiration in the UK "
In the US, CPR certifications and training all taught breath-and-compress UNTIL this year. The standards have changed following multiple studies that apparently all agree the breathing part of CPR is not necessary. If oyu can do it, if you have extra hands or equipment
, fine. But the current
training has I think all shifted to the new standard, which is to perform chest compressions only and to keep on doing so as long as physically possible.
Which leaves an odd problem for "good samaritans" in the US, since legally you are supposed to respond as trained and certified
--but now, that's the wrong response.