How far were Conservative scandals the most important reason for the defeat in the 1964 election?

How far were Conservative scandals the most important reason for the defeat in the 1964 election?
The Conservative failings of selecting a poor leader undemocratically after the resignation of Macmillan, taking dramatic measures during the ‘Night of the Long Knives’, as well as the numerous embarrassing scandals, all led to a Labour victory in 1964. A resurgence of the Labour party also changed the voting patterns of the electorate as Wilson now promoted a young and fresh approach to politics, which had been missing during the ‘establishment’ years of the Conservatives.
Towards the end of Macmillan's premiership the Conservative party was rocked by many scandals, including the Vassel affair, the Argyll divorce and most famously the Profumo affair. It was to be the Profumo affair that was most damaging to the Conservatives and Macmillan, as it was found that John Profumo, the minister for war, had been having an affair with a call girl named Christine Keeler. Profumo had met Keeler at Cliveden house, at an event hosted by Lord Aster, where Keeler was swimming naked in the pool. Soon the pair was having regular sex, but unbeknown to Profumo, Keeler was also sleeping with a Russian attaché called Ivanov. The Profumo affair may never have broken if it weren’t for one of Keeler’s ‘other’ men, a violent West Indian drug dealer. He tracked Keeler down one night to Stephan Ward’s flat, a famous osteopath that also arranged call girls for upper class men, and when she refused to let him in he fired a shot at the flat, the police were called and the press soon arrived and it wasn’t long before the rumours about Profumo were being circulated. Profumo was summoned to the House of Commons, and when questioned on the matter he strongly denied he had ever had sex with Christine Keeler. Unfortunately for Macmillan, he never doubted Profumo. Soon after, Profumo admitted the affair to his wife and immediately resigned; this was highly embarrassing for the Conservatives as it appeared as though Macmillan was losing his political grip. It was also a major security threat as no one knew what ‘cross pillow’ talk had been passed on through Keeler to Ivanov. Stephan Ward was also charged with living off the profits of prostitution and during his trial committed suicide.
