Thanks for all the help everyone.
I've been googling Boom Hall ( like I say, I like this option better than the poor house

....because I thought it was an area of Londonderry, but it is actually a stately home. Until I track down my Great Grandfathers birth certificate, would it be feesable to think that HIS parents worked at the house or on the estate ? Or would it be unlikely that the child of a servant would be born at the house ?