“The burden of proving due execution, whether by presumption or by positive evidence, rests on the person setting up the will … In certain circumstances, however, the maxim omnia praesumuntur rite esse acta will apply and due execution will be presumed.”
“The presumption applies, however, with less force where the document in issue does not include a full attestation clause ... Phillimore J explained as follows in Re Bercovitz Estate, Canningv Enever[1961] 1 WLR 892 (at 896): ‘The force of the presumption or maxim varies with all the circumstances. Where a document is entirely regular in form it may be very strong; but where, as here, it is irregular and unusual in form, the maxim cannot apply with the same force.’ In Bercovitz, Phillimore J took the question he had to decide to be ‘whether, in all the circumstances of this particular case, it is more probable that what was done was done as it ought to have been done to render the will valid.’ (see[1961] 1 WLR 892 at 895).”