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"In older children, it's much more like adults - we use abdominal thrusts or what people would often have referred to as the Heimlich manoeuvre," Dr Ruddle said.

Who, What, Why: How easy is it to do the Heimlich manoeuvre?

The footage then shows Mr Rifat spot the group and help Mr Snelling to his feet before performing the Heimlich manoeuvre, dislodging the food he was choking on.

Kenneth Francis told the inquest into Gwyn's death that Selwyn had choked on a piece of steak at the same pub 18 months earlier but the obstruction had been cleared by someone performing the Heimlich manoeuvre.

When he returned to the bar he began choking and a customer patted him on the back while another carried out the Heimlich manoeuvre, dislodging a small piece of meat.