AMEND LAST SENTENCE SO AS TO READ:  Subject to the power to receive extrinsic evidence pursuant to the provisions of section 21 of the Administration of Justice Act 1982 [fn4a], parol evidence is not admissible to show that the testator intended to include property which he wrongly thought to be his own in a general devise or bequest [fn 5].

ADD NEW NOTE 4a:  Frear v. Frear [2008] EWCA Civ 1320