They can Gordon but only for a certain period of time,
GB has reciprocal exchange agreements with Gibraltar and 15 designated countries.
The designated countries are:
Australia, Barbados, British Virgin Islands, Canada, Falkland Islands, Faroe Islands*, Hong Kong, Japan, Monaco, New Zealand, Republic of Korea*, Singapore, South Africa, Switzerland and Zimbabwe.
If you are a visitor in GB, and hold full ordinary entitlement, you can drive any category of vehicle, up to 3.5 tonnes and with up to eight passenger seats, shown on your licence for up to 12 months from the date you last entered GB, whether or not you brought the vehicle into GB. If you also hold full entitlement to drive large lorries or buses you are only allowed to drive large vehicles registered outside the GB that you have driven into the country.
If you are a resident in GB and provided your full licence remains valid, you can drive small vehicles for 12 months from the time you became resident. To ensure continuous driving entitlement, you must exchange your licence for a GB one before the 12 months end.
If you do not do this you must stop driving although you may apply to exchange your licence at any time within five years of becoming resident.