Drive as part of your paid job? (Incidental Drivers)

An incidental driver is someone who has Category B on their driving licence but doesn’t have category D or D1 and who might drive a minibus as a small part of their paid job (e.g. teachers or care workers). But if they are paid staff, can they be volunteers? Government departments were asked to answer the question: ‘Are teachers volunteers when driving the school minibus?’
They suggested that to be driving as a volunteer:
Minibus driving must not be on your job description
You must be able to refuse minibus driving duties
You must not be paid for driving but can receive genuine ‘out of pocket’ expenses.
This advice is not law. Some organisations follow the advice, whilst others insist all their drivers have D1 on their licence. Some organisations have minibuses over the weight limits, so drivers need D1 on their licence by law. For more information about how to get D1 entitlement added to a licence visit the adding higher categories to your driving page on the GOV.UK website. https://www.gov.uk/adding-higher-categories-to-your-driving-licence