- Greater use of technology such as video links will put an end to an "unacceptable" level of paperwork and delays
- Aim for the criminal justice system will be a single case file that progresses electronically right through the system from police to court and then prison or probation
- That would end the need to constantly re-key information
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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.