Back in 1999 we had to recover an aged VC10K2 from St Athan where it had been in 'storage' - it was needed for one of Bliar's mini-wars or something.
During the air test, we had a serious electrical issue during the shutdown and relight sequence, such that it suffered the "It can't happen" #1 & #3 bus fail. Well actually, BWoS, it can and did! Lots of lights, various PCUs failing and cabin alt increasing - together with all gyro instruments running down.... Fortunately after relighting the engine we restored the power, although various bus ties were cross-line to protect the system as we took it to Brize. The cause of the failure was corrosion in an alternator control panel due to the wonderful Welsh climate, which caused a slow electrical failure.
A few days later we took it for a partial air test including a ELRAT drop. Again a serious problem, this time due to corrosion in the ELRAT alternator system.
It was all fixed and took us across the Pond to China Lake a couple of weeks later though.
But 150 has been sitting around for ages and the spares situation is hardly what it was when that VC10K2 gave an experienced air test crew such a nasty surprise in 2 consecutive sorties. Even if structurally sound with 4 good engines, although flying it might seem straightforward, it would need a VERY experienced air engineer to cope with the vagaries of an electrical system that has been sitting around for ages with no certified spares available.
I simply cannot see 150 ever flying again...….