Sch 5A para 20
If a scheme has conferred authorisation in relation to development of a kind that regulations under paragraph 19 state cannot be granted authorisation by a scheme— (a) the scheme ceases to have the effect of granting authorisation for any new development of that kind from the date the regulations prescribe, but (b) the authorisation granted by the scheme is unaffected by the regulations in relation to development begun before that date.