FA97/Sch12 contains no special relieving provisions for lease
rentals which become bad or doubtful. This is because the trading
income rules give appropriate relief as they stand.
For example, take the case of an existing lease with a
stepped rental profile outside Schedule 12 where the lessee becomes
insolvent (and for simplicity the asset becomes worthless).
The fact that the leased asset has become worthless will be reflected one way or another in the capital allowances computation (to the extent that the leased asset attracts capital allowances).