"A spokesman for the Department for Transport (DfT) said: ‘Passengers are not permitted in the cockpit while the engines are running. The rules apply to all UK-registered planes and to any plane operating in UK airspace.
‘Clearly we will investigate if we receive details of the alleged incident.’
"But the DfT said the no-passenger rule applied to flight decks of all commercial planes, regardless of whether they were scheduled flights or private charters."
So let's await for their findings.