“Assumed gains” means any chargeable gains, other than actual gains, which, on the relevant assumptions, would accrue to the vulnerable person and in respect of which, on those assumptions, he would be chargeable to capital gains tax for the tax year.

“Assumed losses” means any allowable losses, other than actual losses, which, on the relevant assumptions, would accrue to the vulnerable person in the tax year.

In this paragraph “relevant assumptions” has the meaning given in paragraph 7.