One of the problems is that it's perfectly legal to fly outside Farnborough's ATZ, through the IAP - marked on 1/4 mil and 1/2 mil maps - without talking to them.
On a bright, VFR Sunday it's copeable with - especially with radar - even if it is stoooopid.
On a less than brilliant day, I can see that causing some problems.
And the bright yellow Cub (or similar) which did that on a very busy Sunday in the summer showed a commensurate lack of airmanship by doing so.