A total of 10 out of 14 Council-licensed vehicles failed random spot-checks last weekend (Friday, 7 July and Saturday, 8 July) during an exercise with Thames Valley Police in Milton Keynes.
Andrew Grant, portfolio holder for licensing, who also attended the Saturday night spot-check, said:
'To find that only four of the 14 taxis and drivers were roadworthy and complying with the terms of their licence is extremely disappointing. The majority of taxi drivers in our district operate a perfectly legal and safe service, but we are determined to crack down on the few who don't with unannounced tests such as this one.
'Our intention is to increase the standards of service provided by our taxi and private hire fleets, and that includes the use of clean, safe and roadworthy vehicles.'
The council carries out vehicle checks with the police every three months and does its own checks every two months.
Taxis licensed by Milton Keyes Council, South Bedfordshire DC and Aylesbury Vale DC were also included in the exercise.