Who cares what's the reason for ANYthing in Pommyland??? Are you showing off?????
Anyway we're talking about CG here...
Problems with weather-diversions in CG? Anyone who doesn't carry a little extra on a bad day is a FOOL.
CG rarely suffers from anything that won't blow through in a short space of time. Patchy low cloud may prevent a successful approach at one moment but will often allow an easy run on the next attempt.
Diversions to BN and cumulative effects thereof cost a hell of a lot more than the cost of hauling the odd extra ton when it's perfectly obvious the weather is a little crappy.
But they don't need an ILS.