I no longer work for the company in question, but yes, the guys did there own risk assessments, many letters were sent and a great deal of 'discussion' with management and they (management) have ignored all concerns raised. The helmets were introduced as a knee-jerk reaction after a maintainer fell off the bottom step of a stand (which he was not using correctly-didn't apply the brakes) and sustained a head injury.
I would like to let as many people know of the dangers involved with wearing helmets in an attempt to prevent other companies following suit, it is extremely dangerous and is directly affecting the ability of maintenance personnel to unsure inspections are carried out correctly and thoroughly.