Apologies, they are not using mixed mode on centre runway. However on their four mode plan it shows that 75% of landings on the same runway, twice on parallel runways, likewise for departures. This appears on page 32 of HAL Our approach to Noise document.
Originally Posted by
Trinity 09L
HAL have told me they’re paying for the M25 diversion,tunnel & runway on top. As they do not know the length of R3 anything can happen
HAL are paying for M25 etc.