This thread contains comments to article "Valentines Day dilemma: Office relationships and sexual harassment": http://www.personneltoday.com/articles/2012/02/14/58342/valentines-day-dilemma-office-relationships-and-sexual-harassment.html.
Whilst the action suggested above may "minimise the risk of a tribunal claim", I don't think it's going to do much to enable the two people involved to re-establish an effective working relationship! You might want to consider whether offering them the opportunity to use the services of an independent, impartial third party to facilitate communication between them (otherwise known as workplace mediation). Of course, it may not be appropriate and since mediation is optional that would be for them to decide. It does however offer the possibility of a confidential, future-focused process which has an extraordinarily high success rate when both parties enter into it in good faith. What's more, if they manage to resolve the matter for themselves the chances of a tribunal claim (and, dare I suggest it, the need for legal advice?) are substantially reduced.
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