No liability to income tax arises in respect of the provision of coal or smokeless fuel or an allowance paid in lieu of such provision if the employee is a colliery worker and the condition in subsection (2) is met.

That condition is that the amount of coal or fuel provided or in respect of which the allowance is paid does not substantially exceed the amount reasonably required for personal use.

That condition is assumed to be met unless the contrary is shown.

In this section “colliery worker” means a coal miner or any other person employed at or about a colliery otherwise than in clerical, administrative or technical work.