Companies/organisations are required to appoint somebody to advise on H&S matters.

For such a small fee, its probably just a telephone advice service - keep someone on a retainer, call them on the phone if advice is required.

Yes, but not usually as a stand alone service.

In my experience, as part of a consultancy services package e.g. write a safety policy, risk assessment report/service, agreed number of site visits.

In which case the overall fees are much more than £350

The phone service is a bit of a 'loss leader' / freebie - as many clients never call.

I've encountered two medium sized firms that did this for a time instead of in-house safety advice, so I don't think it can be that uncommon - although I'd expect it to be more common in smaller firms for whom it might actually make sense.

Comments like "what quality professional service can be provided for £350" seem to me to not understand what it is like being a consultant and help no one. Why the constant sniping at consultants? At the end of the day it is a highly competitive world out there. Also, for £350, you get £350 worth of competent advice. This may be enough or not enough depending on your risks. You want more, you pay more.