The service currently runs 350 minibuses

Ken Livingstone has abolished Dial-a-Ride fares, which will benefit about 50,000 users who make 1.2m trips each year on 350 minibuses.

The free scheme, which starts on 1 January, is costing Transport for London (TfL) �700,000 in lost fares.

Mr Livingstone said the scheme was part of his commitment to providing equal access to public transport.

Vital lifeline

He said: "We are improving access to a vital lifeline for some of London's most vulnerable people, many of whom are on lower incomes.

"This is just the first step in our absolute commitment to revamp current door-to-door services."

He said he aimed to make door-to-door services more widespread and flexible.

Samantha Mauger, of Age Concern London, said the free scheme would "help to enable thousands of older people on low incomes to participate more actively in London life".

She said it could also help to reduce the isolation many people with disabilities or mobility problems.

Dial-a-Ride is a door-to-door transport service for older and disabled people who cannot use buses, trains and the Tube.