"Doctor Who is now one of the BBC's biggest flagship shows," he tells SFX. "And this sort of pattern will guarantee it being on air for twenty years.
"It's no good looking at that American pattern of making seven years if you're lucky - that's just not going to work. Who wants it to die after seven years? It's much bigger than that.
"It needs looking after, in the sense that it needs pauses, it needs its legend revamping every so often. If you build these pauses in now and say this will always happen, that's part of the plan now - it's literally a twenty year plan, which can't be guaranteed, because different people will be in charge in years to come - but if you present them with something rock solid, that is working, and has a unique transmission pattern that shouldn't be interfered with, then it will stay."
You can read the full interview in SFX 168 , on sale from Weds 12 March.