M.1 Development is not permitted by Class M—
(a)if the cumulative gross floor space of any buildings erected, extended or altered would exceed—
(i)25% of the gross floor space of the original school, college, university or hospital buildings; or
(ii)100 square metres,
whichever is the lesser;
(b)if any part of the development would be within 5 metres of a boundary of the curtilage of the premises;
(c)if, as a result of the development, any land used as a playing field at any time in the 5 years before the development commenced and remaining in this use could no longer be so used;
(d)if the height of any new building erected would exceed 5 metres;
(e)if the height of the building as extended or altered would exceed—
(i)if within 10 metres of a boundary of the curtilage of the premises, 5 metres; or
(ii)in all other cases, the height of the building being extended or altered;
(f)if the development would be within the curtilage of a listed building; or
(g)unless—
(i)in the case of school, college or university buildings, the predominant use of the existing buildings on the premises is for the provision of education;
(ii)in the case of hospital buildings, the predominant use of the existing buildings on the premises is for the provision of any medical or health services.