No sure if you live in Dublin, but I use Hollingsworths in Kilmacud, Stillorgan and find them very good.
My wife got her old school bike, a 1968 Hercules serviced there last summer, new wheels, tyres, saddle and a full service for around €150.
One thing to note is depending on the condition of the bike it might be cheaper to buy a new one unless you have a sentimental attachement
As for a new equivalent Raleigh do a range called the Pioneer or there is a brand called Bobbin that are old fashioned styled new bikes