A Heathrow Express spokesperson, said:
“93% of our passengers are satisfied with the Heathrow Expressservice which is a 3% increase since Spring 2012. We have spent £15 million pounds on upgrading the Heathrow Express fleet since May 2012 and have improved passenger information on board, online and on mobile devices. We are continuing to invest in improving all aspects of customer service.”
More top news
The 24-year-old was unarmed and the incident is not being treated as terror-related.
Some platforms have been taken out of service with disruption expected to continue until the end of the day.
The Met Office has extended its weather warnings for snow and ice to cover vast swathes of the country, including London and the South East.