London's railway "blackspots" have been identified where services often fail to run on time.
The study analysed data from website On Time Trains to reveal the proportion of trains which were at least one minute late or cancelled from the 10 busiest stations in London.
Last month the Government commissioned a review of Britain's railways which will consider all parts of the network, including accountability, the franchising system and value for money.
New timetables introduced in May saw widespread disruption to services in the south-east.
Which? managing director of public markets Alex Hayman said:
Here are the stations included in the report, with the proportion of trains delayed or cancelled.
- 1. Clapham Junction 54%
- 2. London King's Cross 45%
- 3. London Victoria 44%
- 4. Stratford (London) 41%
- 5. London Bridge 40%
- 6. London Waterloo 39%
- 7. London Paddington 38%
- 8. London Euston 33%
- 9. London Liverpool Street 32%
- 10. London St Pancras (Intl) 30%