Back to the subject!
A330 default in the computer gives a low speed in the descent and with its very efficient wing wants anearly descent, if you input a faster (.8/300kts) descent it is less fuel efficient but will fit in better with the other types. If you leave the guys up who have NOT put in the faster speeds, they should still be able to make it down using 'open' descent (and maybe some speedbrake) and leaving the aircraft flying the faster speed. Going into LGW it is not usually a problem due to the FL130 by goodwood and FL270 at Gibso ( if comming of the ocean).