The BBMF have operated PA474 for more than 40 years without a significant incident or problem that I can recall, although I think she was re-sparred a few years ago.
Just Jane flew back from Down Under as G-ASXX in the 1960s and did a few airshows as such; also Strathallan's Lanc flew across the pond as G-BCOH in the 1970s - she was badly damaged in the hangar roof collapse at Woodford during airworthy restoration to fly in the 1980s for Charles Church. Doug Arnold also registered G-LANC for rebuild to fly, although she is now a static exhibit at Duxford. So it's not without precedent and wouldn't the earlier operations confer some sort of Grandfather rights on the type?
Provided the Pantons can tick the CAA's engineering boxes and are happy to finance it, then why not?
JEM60, that was it! Speculation was probably on Flypast site (before I even read the article).