The difficulty in the actual application of these conceptions is to distinguish the matters fundamental or cardinal to the prior decision or judgment, decree or order or necessarily involved in it as its legal justification or foundation from matters which even though actually raised and decided as being in the circumstances of the case the determining considerations, yet are not in point of law the essential foundation or groundwork of the judgment, decree or order."
13 It is necessary to determine what is the issue of fact or law with which I am concerned in this matter. The ultimate issue on the hearing of the case before His Honour was whether or not there was a prime face case that the caveator was the deceased's de facto spouse at the date of death. Given His Honour's reference to part 31 it is unlikely that he was deciding that she had a reasonable prospect of establishing her claimed interest.
14 The issue of fact determined by His Honour may well have been whether there was a de facto relationship at the date of death disclosed by the evidence read on the application. In that sense His Honour no doubt decided that in respect of that evidence no such relationship was shown. The effect of his order was to prevent a trial of that issue in the probate proceedings.
15 The issue before me is whether, on the evidence before me, there was a de facto relationship at the date of death. This seems to be a different issue from that debated before His Honour which was whether there was then a prima facie case.
16 Even if I am wrong on this aspect there is another reason why the issue estoppel should not apply. A special exception applies to issue estoppel and was referred to by Lord Keith in Arnold v National Westminister Bank PLC (1991) 2 AC 93 at 109:
"In my opinion your Lordships should affirm it to be the law that there may be an exception to issue estoppel in the special circumstance that there has become available to a party further material relevant to the correct determination of a point involved in the earlier proceedings whether or not that point was specifically raised and decided, being material which could not by reasonable diligence have been adduced in those proceedings. One of the purposes of estoppel being to work justice between the parties, it is open to courts to recognise that in special circumstances inflexible application of it may have the opposite result, as was observed by Lord Upjohn in the passage which I have quoted above from his speech in the Carl Zeiss case [1967] 1 AC 853 at 947.
17 In the hearing before me Anita Puntillo gave important affidavit and oral evidence. She swore to the fact that at the time the application was before Mr Justice Young she was asked to swear an affidavit but refused to do so on the advice of her then solicitors. Given Mr Justice Young's directions about filing affidavit evidence it seems that this evidence could not by reasonable diligence have been brought forward for that hearing. In these circumstances I would not allow the issue estoppel to be raised.
18 Having decided that there is no issue estoppel which prevents the plaintiff raising it, I turn to the question whether the plaintiff was living with the deceased in a de facto relationship at the date of his death. The Wills Probate Administration Act incorporates definitions from the Property (Relationships) Act 1984. Section 4 of that Act relevantly defines de facto relationship in the following terms.
"De facto relationships
(1) For the purposes of this Act, a de facto relationship is a relationship between two adult persons:
(a) who live together as a couple, and
(b) who are not married to one another or related by family.
(2) In determining whether two persons are in a de facto relationship, all the circumstances of the relationship are to be taken into account, including such of the following matters as may be relevant in a particular case:
(a) the duration of the relationship,
(b) the nature and extent of common residence,
(c) whether or not a sexual relationship exists,
(d) the degree of financial dependence or interdependence, and any arrangements for financial support, between the parties,
(e) the ownership, use and acquisition of property,
(f) the degree of mutual commitment to a shared life,
(g) the care and support of children,
(h) the performance of household duties,
(i) the reputation and public aspects of the relationship.
(3) No finding in respect of any of the matters mentioned in subsection (2 ) (a)--(i), or in respect of any combination of them, is to be regarded as necessary for the existence of a de facto relationship, and a court determining whether such a relationship exists is entitled to have regard to such matters, and to attach such weight to any matter, as may seem appropriate to the court in the circumstances of the case.
(4) Except as provided by section 6, a reference in this Act to a party to a de facto relationship includes a reference to a person who, whether before or after the commencement of this subsection, was a party to such a relationship."