The media has highlighted cases where potential donors have been approached by fundraisers who seemingly fail to meet the exacting standards that we insist on.
This has led to a wider debate about the value of face-to-face fundraising as a technique at all.
More top news
The Labour leader did not say whether he would maintain Britain's nuclear deterrent programme.
Ukip leader Paul Nuttall also said he would want to get rid of Sharia courts.
Over 40,000 people picked up their packs to take part in the annual marathon in the capital.