The codes printed on your driving licence tell you what conditions you must meet to drive.

The codes and their meanings are as follows:

01 - eyesight correction
02 - hearing/communication aid
10 - modified transmission
15 - modified clutch
20 - modified braking systems
25 - modified accelerator systems
30 - combined braking and accelerator systems
35 - modified control layouts
40 - modified steering
42 - modified rear-view mirror(s)
43 - modified driving seats
44 - modifications to motorbikes
44 (1) - single operated brake
44 (2) - (adjusted) hand operated brake (front wheel)
44 (3) - (adjusted) foot operated brake (back wheel)
44 (4) - (adjusted) accelerator handle
44 (5) - (adjusted) manual transmission and manual clutch
44 (6) - (adjusted) rear-view mirror(s)
44 (7) - (adjusted) commands (direction indicators, braking light, etc)
44 (8) - seat height allowing the driver, in sitting position, to have 2 feet on the road at the same time
45 - motorbikes only with sidecar
46 - tricycles only (for licences issued before 29 June 2014)
70 - exchange of licence
71 - duplicate of licence
78 - restricted to vehicles with automatic transmission
79 - restricted to vehicles in conformity with the specifications stated in brackets on your licence
79.02 - restricted to category AM vehicles of the 3-wheel or light quadricycle type
79.03 - restricted to tricycles
96 - allowed to drive a vehicle and trailer where the trailer weighs at least 750kg, and the combined weight of the vehicle and trailer is between 3,500kg and 4,250kg
97 - not allowed to drive category C1 vehicles which are required to have a tachograph fitted
101 - not for hire or reward (that is, not to make a profit)
102 - drawbar trailers only
103 - subject to certificate of competence
105 - vehicle not more than 5.5 metres long
106 - restricted to vehicles with automatic transmissions
107 - not more than 8,250 kilograms
108 - subject to minimum age requirements
110 - limited to transporting persons with restricted mobility
111 - limited to 16 passenger seats
113 - limited to 16 passenger seats except for automatics
114 - with any special controls required for safe driving
115 - organ donor
118 - start date is for earliest entitlement
119 - weight limit for vehicle does not apply
121 - restricted to conditions specified in the Secretary of State’s notice
122 - valid on successful completion: Basic Moped Training Course
125 - tricycles only (for licences issued before 29 June 2014)

Some codes may be different in Northern Ireland.