Eire 90
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Not Modern Antiquarian in type but a slightly less terse equivalent to the Batsford guides (despite its title) is "Guide To National and Historic Monuments of Ireland" by Peter Harbison ISBN 0-7171-1956-4. Try to see if your local library can get one through another library.

I'll have a go at sourcing that - thanks!

The National Monuments Guide has about three stone circles in it. Best not to bother if that's what you're after. It mainly deals with Early Christian stuff - because Ireland only likes this part of it's history (except for Newgrange which makes them a fortune!)

Any specific questions on Ireland just ask and I'll try to answer them.