Error in Deed of Variation

A DOV included a trust in its schedule and defined the trust fund as including items A and B, or assets representing them for the time being-with no power to accept other assets.

The body of the deed left items A, B and C on the trusts, as the draftsman forgot to delete reference to C.

Is item C a trust asset, or can it be argued that the trustees had no power to accept it, so even though they signed the Deed the gift of C is invalid?

Simon Northcott