I showed up at Southend, uttered a price per each, was laughed at and told the whole ex-BA purchase had been less.
I guess Mike Keegan got quite a bargain.
Rumour at the time, fuelled by leaks from Danny Bernstein's office, said that the price per airframe, c/w 4 engines, full shipset of seats, galley etc, was £60K. Spares were taken and paid for at original cost price when needed.
I have no idea if this is correct. Knowing Mike Keegan it's very plausible.