One interview not to be found there is the one with Ronald Dworkin about political philosophy from the 1978 series Men of Ideas.
Towards the end of it Dworkin puts his finger on what is the central challenge for modern Liberals and for particularly for anyone trying to develop a coherent social liberal philosophy for the Liberal Democrats:
Those words were spoken more than 30 years ago but still sounds vital and urgent today. Can anyone recommend a liberal theorist who has made progress in this direction?
The practical problem is this: there are certain things we all want government to do. We want government, for instance, to select methods of education, to sponsor culture, and to do much else that looks, on the surface, like endorsing one set of personal values against another and therefore contradicting liberalism.
It is very important for liberals to develop a theory that would make a distinction here between enriching the choices available to people and enforcing a choice upon people.
The crucial idea, it seems to me, is the idea of imagination. The liberal is concerned to expand imagination without imposing any particular choice upon imagination.
But I've simply named a problem. I haven't met it. It does seem to me that liberalism is rather weak at this point and needs a theory of education and a theory of culture-support that it does not have.