A will executed by a terminally ill testator receiving morphine and Midazolam via syringe driver on the last day of life may be set aside for lack of testamentary capacity where uncontradicted expert evidence establishes it was unlikely the testator understood what he was signing. The rule in Parker v Felgate does not apply where the solicitor departed from the testator's instructions in a substantial respect and did not explain the divergence to the testator. Delay of over nine years in seeking revocation of a grant of probate does not preclude relief where the applicant reasonably believed the will reflected the testator's intentions and was advised by a solicitor that it was too late to challenge the will.
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