The latest Heathrow flight pattern trial has begun and residents are being urged to report the impact.

BAA's Operational Freedoms testing period, which runs until March 31 next year, aims to explore new flight procedures to see if Heathrow can be run more effectively without increasing the total number of planes landing or taking-off from the airport.

But Wandsworth Council will be scrutinising the trial closely to ensure the noise impacts are properly considered before any of the test procedures are made permanent.

Council leader, Councillor Ravi Govindia, said: "These trials affect our daytime respite periods when we would normally expect a break from overhead flights. "We want to ensure the impact of these changes on local people are recorded and taken into account. If you have noticed changes in aircraft noise then please let us know."

Under established rules Heathrow is only permitted to use one runway for take offs and one for landings. Their use is switched every day at 3pm to give residents under the flight path a regular break from overhead planes.

During the trial BAA is permitted to use both runways at the same time for arrivals when incoming flights face a delay of 10 minutes or more.

This can mean more flights landing over central London during half-day respite periods when Wandsworth residents would normally get an eight hour break from aircraft noise.

Visit www.wandsworth.gov.uk/heathrowsurvey to register your feedback or contact BAA direct using freephone number 0800 344 844 or by emailing noise_complaints@baa.com.