There can be no reason why the MoD or CAA shouldn't allow Lightning should fly again.
Nothing to do with MoD.
CAA won't ever let a civvie Lightning fly in UK....fullstop.
Vulcan is flying because BAe agreed to DA, they flatly refuse to do so for a Lightning. There's also a bigs spares issue with a potential Lightning operation anyway, just about all, if not all lifed available spares are held by Thunder City in SA, although I believe AALO out in the USA has anything else left.
There's at least one in the museum at Salisbury Hall that could fly again.
Yes, and it was surveyed after the tragic loss of BAe's RR299 with a view to making potentially airworthy, but there was no finance available for any return to flight.
And on that subject, BAe have also withdrawn any type DA as well so this particular Mossie is the only candiate for a UK flying example. So, unless someone wants to donate a few million for it's restoration and probably subsequent donation to BBMF for operation......it ain't gonna happen.