"I'd never heard of Birrell prior to this thread"
Birrell is not really a famous journalist - he is not like a Hitchens, Melanie Phillips, Peter Oborne, Polly Toynbee etc, - in the sense that he writes a widely read regular column
He was a former Deputy Editor of the Independent and writes for a number of papers - the Guardian, Daily Mail etc
I don't know if he is a member of any party, but he seems to be a conservative on the modernising, liberal side, but I don't know.
Journalists I like are Peter Oborne on the Telegraph, Melanie Phillips who used to be on the Mail, but I don't know who she writes for now, Hitchens on the Mail. Can't think of anyone else just now, but I don't read much apart from the Mail anyway. I just think there is so much spin from politicians and even newspapers that I end up ignoring it and getting the lowdown from the Mail and Dacre's editorials.
On the net, I sometimes go to the Spectator, which is good. I like some of the journalists who make me laugh such as James Delingpole and Rod Lidell, but I hardly ever read them.