The Liberal Democrat leader has said his party will not enter into coalition government again "unless we get an approach to balance the books and do so fairly".
Nick Clegg, who was speaking at Land's End as he began a tour to John O'Groats, said: "For instance that means not asking millions of public sector workers to have any more cuts to their take home pay."
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The shadow chancellor appeared to differ from his leader, who had been initially reluctant to blame the Kremlin for the ex-spy attack.
The Foreign Secretary said the Kremlin's tit-for-tat expulsion of 23 British diplomats would only impact Vladimir Putin's compatriots.
Sunday will be bitterly cold with snow for most.