After a week in Blackpool where he went round every industrial estate in Preston and left the wife with the kids she went to Greece, presumably ended up fucking Tom Conte as per Shirley Valentine, arrived back via the solicitors with the divorce petition.
That's odd because that was my exact thoughts when I saw the original series too! She's likely been getting some extra-curricular D while on a foreign holiday away from prying eyes.
Happened to a colleague of mine with his L/T GF last year - had a feeling it was going to then as well.