The short answer, given by Arnold J in his judgment in Williams v Hull [2009] EWHC 2844 (Ch) is  “without prejudice to my position in any subsequent proceedings”.

The judge reached this conclusion in an application centered around the interpretation of a single letter sent by Mr Hull, a financial consultant, to his former cohabitant, Ms Williams, a solicitor, concerning the value and allocation of their jointly owned home and its contents, following the breakdown of their relationship.

Mr Hull had said that he thought he owned half of the property. Ms Williams contended he owned 7%, based on a draft Deed of  Co-ownership prepared, but never signed, when the property was purchased.

In his letter dated 19 October 2009 and headed “Without Prejudice” Mr Hull advanced arguments based on an assumption that he owned 12% of the property, not half. Not unnaturally, Ms Williams sought to tie Mr Hull to that concession. If the letter was validly headed “Without Prejudice” she could not, but if it wasn’t then she could.

Arnold J reviewed the established authorities and concluded that the “without prejudice” rule is founded on the public policy of encouraging litigants to settle their differences. It is intended to enable parties in dispute to lay their cards on the table  and negotiate without fear that by so doing they will have compromised their legal position, if subsequently their issues are taken to a litigated conclusion.  Whether or not a particular document bears that heading or whether proceedings have been issued is not an essential requirement; it’s all a question of context and interpretation.

On his interpretaion of three letters passing betwen these parties, the second and third of which were headed “Without prejudice”, the label was properly applied, and was not a “cloak for perjury” or a mere assetion of rights as Ms Williams had contended; consequently, the content of the “Without prejudice” correspondence should not be referred to at trial. In reaching this conclusion he reversed the decision of HHJ Marshall QC, who first considered the point.

Whilst the decision has provided clarity for these parties, issues of context and interpretation continue to mean that for the label to be effective, thought has to be given to its use.  The case also underlines that in such circumstances it remains better to be safe than sorry – if you are buying property jointly, don’t just have a deed drafted, have it signed and dated too!