You
will need to take a theory test if you
want a licence for a new category of
vehicle, for example, if you have a
car licence and you want a motorcycle
licence you will need to take a theory
test.
If,
however, you want to upgrade within
a vehicle category you will not normally
need to take a theory test, for example,
if you have a full automatic car licence
and you want a manual car licence you
will not have to take a theory test.
It
is your responsibility to make sure
you have the correct licence for the
vehicle you are driving. If you are
unsure if you need to take a theory
test please contact the Driving Standards
Agency (DSA) or the Driver and Vehicle
Licensing Agency (DVLA).