Aer Arann according to the website have bases in Dublin, Galway, Cork and Waterford.
But let's not get ahead of ourselves! While they don't have bases in either Edinburgh or Manchester, they do however serve both those cities and so could simply do a W from Edinburgh or Manchester!
Interestingly they also serve Bristol (from Cork). Remember the LDY-BRS route served the equivalent of 45K pax p.a. when operated by Ryanair, substantially larger that the 17K p.a. the LDY-MAN carried in 2005. But again, let's not get ahead of ourselves.