In 1983 HK Aircraft Engineering Co extracted 4 of the CAAC V.843 and most of their Darts. These had been the only 8-engined Viscounts, 100% spares were bought as was their experience of USSR-types. Some were NTSN, the a/c were low time, too.
HAECO overhauled them to full CAA Requirements, so not quick or cheap. I showed up at Southend, uttered a price per each, was laughed at and told the whole ex-BA purchase had been less. They didn't even want NTSN engines, enough came in the BA deal.
We moved most engines to US for F-27, the a/c to Indonesia on HP.