Wolverhampton Council has more than 40,000 drivers licenced nationwide.
And a significant number of these vehicles have been seen in Bolton.
Now concerns have been raised that the vehicles do not have to use a sticker displaying which company a taxi driver works for.
Siraj Patel, from the Private Hire Taxi Union, has said why he believes this puts those licenced by Bolton at a disadvantage.
He said: “We have to have…