Long-time empty shops

So another positive High Streets story (empty shop numbers at their lowest since December ’09) is diminished by being tied to another about long term empties (http://www.telegraph.co.uk/finance/newsbysector/retailandconsumer/12147104/Shop-vacancies-fall-to-six-year-low-but-dry-January-drags-on-sales.html).
Is it time for a more detailed study of these empties to separate those which are like that because of a lack of demand versus those impacted by supply side factors?
My question is: can we explore what proportion of the long time empty units have one or more of the following characteristics:

1. They’re in a town with no town team and/or BID co working on reducing empties
2. The unit has been stripped by the previous occupier and/or has damage issues, so needs a costly refit to allow re-occupation
3. The rent level is an issue for the would-be tenant(s) but the landlord ‘cannot’ adjust to the ‘market level’ because the rent in that unit is tied to others they have in the town/shopping centre/retail park and/or is impacted by the value they have it at with the bank (which impacts on loans they have)
4. The unit is in a listed building so the landlord is not paying business rates and thus has reduced incentive to let
5. A previous tenant is still paying the rent (until lease expiry) so the landlord has reduced incentive to let, or the previous tenant is in administration and the unit has not been returned
6. The landlord/agent combo have turned down offers preferring to wait for a better offer.
7. There is no agent!

Would welcome your thoughts? Email iain@prbi.co.uk