Just for info, this is the articulation of the policy.
NON FARNBOROUGH BASED SINGLE ENGINED AIRCRAFT, BOTH ROTARY AND
FIXED WING, WILL ONLY BE PERMITTED TO LAND UNDER EXCEPTIONAL
CIRCUMSTANCES. FOR DETAILED INFORMATION CONTACT TAG OPS ON ++441252
379002. SINGLE ENGINED HELECOPTERS WISHING TO OPERATE TO/FROM
FARNBOROUGH HELIPORT DURING FI2008 SHOULD CONTACT ELITE HELICOPTERS
FOR DETAILS.
So clearly no worries if your PC12 is EGLF based. And If you are a down on your luck rock star forced into the single engine turbine class you probably are an 'exceptional circumstance'!