Asked whether paying cash in hand was "morally wrong", Labour leader Ed Miliband said ministers should be focusing on large-scale tax avoidance.
Speaking on a visit to Paris, Mr Miliband said: "What I say is that the job of government is to pass the right laws to clamp down on tax avoidance - that's the most important thing of all.
"What I will be saying to the Government is that they should be clamping down on the large-scale tax avoidance which has been revealed in the past few days and I think that's what people want to see from the Government."
More top news
Tori Lee Castillo, 39, has been arrested on suspicion of child abuse.
Her husband Paul remains in hospital after being seriously injured in the attack -and is it unclear if he knows Elaine has died.
Despite being in the picture, the name of the husband of Luxembourg's gay prime minister was initially left out.