The Mail splashes on immigration and Cameron's "most significant intervention on the biggest issue of the election campaign".
Nonetheless, the weekend's most significant intervention belonged to Erkki Liikanen, head of Finland's central bank.
He launched the most significant intervention since the formation of the coalition in the debate that followed George Osborne's emergency budget on Tuesday when the chancellor of the exchequer said that welfare would bear the brunt of cuts.
The visit by Merkel was the most significant intervention by a German chancellor in London since Helmut Schmidt pleaded with the Labour party to embrace the European project in a speech at Methodist Central Hall, Westminster, before the 1975 EEC referendum.
In a handful of words delivered by a supermodel has David Bowie made the most significant intervention in the Scottish independence debate?
In what was seen as the most significant intervention on the future shape of government in Wales made by a Plaid leader since the creation of the Welsh national assembly 15 years ago, Wood said a new constitution should be written and led by the people of Wales.
In what is arguably the Roundtable on Sustainable Palm Oil's (RSPO) most significant intervention in its 12-year history, the organisation has suspended the certification of one of its founding members, IOI, a Malaysian palm oil company which supplies palm oil to more than 300 companies.
It is his most significant intervention in climate politics since the landmark 2006 Stern review of the economics of climate change, which made the case that tackling climate change as a matter of urgency will be cheaper than attempting to deal with the effects of the problem decades in the future.
In what is being seen as the most significant intervention on the future shape of government in Wales made by a Plaid leader since the creation of the Welsh national assembly 15 years ago, Leanne Wood said a new constitution should be written and led by the people of Wales.
Provider recommendation was the most significant intervention.
