... drivers of certain large vehicles are exempt from the need to hold either a Large Goods Vehicle (LGV) or Passenger Carrying Vehicle (PCV) driving licence. ... http://www.dft.gov.uk/dvla/forms/onlineleaflets.aspx
... A person in receipt of the higher rate mobility component of the Disability Living Allowance may hold a driving licence from 16 years of age. LGV/PCV (Group 2 ... http://www.dft.gov.uk/dvla/medical/aag/L/~/link.aspx