Hospitals across west London are failing to meet A&E waiting time targets, bar only ONE which hit the criteria.
In comparison, London North West had 87.8%, Imperial College had 88.5% and Hillingdon Hospitals were a close third worst at 89.5%. They all recorded their worst performance since June, in December 2015.
A spokesperson for the London North West Healthcare NHS Trust said: "Our emergency departments remain busy in line with pressures felt every winter and there has been a steady increase in attendances year on year.
“We are working with local health partners to ensure patients are being treated and cared for in the most appropriate facility, be that in hospital or in the community.
“We have also forged close links with the London Ambulance Service to better manage the demand to ensure patient safety at all times.”
London North West also missed the target for 85% of patients on the urgent cancer route starting treatment within 62 days of referral, at 82.4%, and has missed the target every month since it switched to being published monthly.
More patients attending A&E
Hillingdon Hospitals NHS Foundation Trust said it had experienced a sustained increase in activity over and above last year, with more patients attending A&E.
A spokesperson said: “We’re working in conjunction with Hillingdon CCG to improve pathways within A&E and increase GP availability out of hours”.
Across England, 91.8% of patients on the waiting list at the end of December 2015 had been waiting fewer than 18 weeks.
This is the first time the 92% standard has not been met since it was introduced in April 2012, showing a nationwide change, with 755 patients waiting more than 52 weeks at the end of December 2015.
Despite this, A&E attendances have dropped on a national level with 1,867,657 attendances at A&E in December 2015, 1.8% less than in December 2014.
Overall, 91% of patients were admitted, transferred or discharged from A&E within four hours of arrival, which is below the 95% standard but higher than the same month last year.
Across England 126 acute hospital trusts missed the 95% A&E target in December, 81% of them, the highest number since June 2015.