There were many things that did in the idea of Boris Island from a poor design point of view, but one was surely that it's runways were still East/West, meaning that aircraft would still pass over the metropolitan area, especially arrivals when they were on Easterlies. And with multiple parallel runways you typically need longer runs in when you are doing parallel approaches.
Have a look at the standard picture of Boris Island, why are the rwys so close to each other? If starting from scratch, wouldn't it be sensible to have wide spaced rwys?
It looks like there is a road crossing the rwy (will there be traffic lights on the road), what are we doing, recreating Lulsgate and the A38?
It also appears to be Boris Reclamation rather than Boris Island.
Crazy nonsesne, but then what can one expect with an aviation advisor who has no experience in the aviation industry.
Why were the runways not north/south ?
Er, because the prevailing winds are from the west?