Two other Black Cab app startups: Get Taxi http://gettaxi.co.uk/ http://gettaxi.co.uk/ Hailo https://www.hailocab.com/london https://www.hailocab.com/london

Two other Black Cab app startups: Get Taxi http://gettaxi.co.uk/ http://gettaxi.co.uk/ Hailo https://www.hailocab.com/london https://www.hailocab.com/london I believe these have faced some resistance in some cities even with a strategy of working with licensed taxi operators.