I’ve just seen your post. Sorry for the delay in responding.
I’m a member of the School of Philosophy at UCD so my knowledge of the School of Economics is derived from what my colleagues and students tell me and the course listings.
To the best of my knowledge, the School of Economics is pretty much mainstream. You shouldn’t expect to find anyone teaching Austrian economics or other non-mainstream theories and my impression is, also, that the history of economics is pretty low on the priority scale.
All that said, the School has a good reputation.