Not uncommon: Wheelchair user 'turned away' by FIVE taxi drivers at Brighton railway station (From The Argus)

Despite legislation: https://www.tfl.gov.uk/cdn/static/cm...passengers.pdf

Under the Act, you must:

• Carry a passenger seated in a wheelchair
• Charge wheelchair users the same fare as non-wheelchair users
• Carry the wheelchair separately if the passenger chooses to sit in a
passenger seat
• Take steps to ensure that the passenger is carried safely and in
reasonable comfort
• Give the passenger mobility assistance as is reasonably required
• Carry a disabled person’s assistance dog, allow it to remain with the
passenger and not charge more for this service.

If you are unable to meet any of these duties because of a medical condition
you must obtain an exemption certificate.