Why can companies not mention the MHRA in materials for a medicine with a conditional licence?

Clause 15.2 states that promotional material must not include reference to amongst others the Medicines and Healthcare products Regulatory Authority 'MHRA' unless specifically required by the licensing authority. This is because the use of an official body's names implies they are aware and agree to the use of their name and could be interpreted to imply some form of endorsement which may not be the case.