HSE guidance INDG462 page 4 ( my bold), seems to suggest they don’t have a problem with hearing protection when required.
Specific job training
Specific job training will normally follow the completion of basic training, but may be
combined or integrated with it. It will be tailored to your particular needs and
include, where appropriate:
■ knowledge and understanding of the operating principles and controls of the lift
truck to be used, especially relating to handling attachments and loads specific
to the job (to be repeated when the design of truck is changed);
■ routine inspection and servicing of that truck, in accordance with the operator’s
handbook or manufacturer’s instructions, which may reasonably be carried out
by the operator (to be repeated when the design of truck is changed);
■ using the truck in conditions the operator will meet at work, eg gangways;
loading bays; racking; lifts; automatic doors; confined areas; cold stores;
slopes; rough terrain; loading platforms; other vehicles; and bad weather;
■ instruction on site rules, eg site layout; one-way systems; speed limits; general
emergency procedures; using protective clothing and devices including
operator restraints and eye and hearing protection; work near excavations and
overhead lines; and other hazards;
■ training in the work to be carried out, eg loading particular types of vehicle with
loads normally found at that workplace; using the lift truck fitted with working
platforms where appropriate;
■ safe systems of work, which should include custody arrangements for keys.