The short answer, explained
Striking a company off the register, or letting it dissolve after voluntary liquidation, doesn't erase its tax history. HMRC can object to a strike-off application, or apply to restore the company after it's gone.
Once restored, the company legally exists again as though it had never been dissolved. HMRC can then continue an existing enquiry, open a new one, or pursue an assessment already raised.
This is a genuine and used power, not a theoretical one. HMRC routinely objects to strike-off notices where a return is outstanding or an enquiry is in progress.

