Examples of exclusive licensees are:
Scenario 1 - where a group of companies exists, one of those companies may be an Intellectual Property holding company which owns the rights and licences them to another company within the group, which is a trading company. In this instance, the trading company needs to have an exclusive licence to be able to benefit from the Patent Box.
Scenario 2 - the company which owns the patent may not wish to exploit the patent in a particular jurisdiction (usually geographically defined), or for a particular field of technology. In this case, the patent owner may decide to licence the patent to a third party to exploit the invention.