Where you live in west London could mean you have to wait much longer for an ambulance to arrive.
People living in the borough of Hillingdon in the UB9 postcode area recorded the slowest median response time of any area in west London.
For at least half of the call outs it took 11 minutes and 44 seconds or longer to arrive, according to a Freedom of Information request to the London Ambulance Service (LAS).
Following, those living in HA6 in Northwood experienced a response time of Red calls in January, at nine minutes and 50 seconds.
In the first month of this year, LAS responded to 67.3% of Red 1 calls, the most critical patients, within eight minutes or less, and 60.9% of Red 2 calls, serious but less critical.
HA1 in Harrow recorded the fastest median response time for Red calls, with half of the 235 calls to the postcode taking four minutes and 50 seconds or less.
Across England, the figures were 70.5% of Red 1 calls responded to within eight minutes in May, the twelfth month in a row in which fell below the standard of 75%.
In addition to this, 65% of Red 2 calls were responded to within eight minutes - this standard has not been met since January 2014.