399. Compensation in respect of retained interests.

Where any person has begun to exercise any right1 in relation to any coal2 or coal mine3 comprised in or lying under any land in which a retained interest4 subsists, and a right to compensation has not arisen under this provision in respect of the exercise of the right by a person whose right it was previously, then the person who has begun to exercise the right must pay compensation in respect of that interest5. Compensation is to be calculated by reference to the consideration which, on the date on which the exercise of the right began, would have