Dear Elwyn, I am due you two big thank-yous. Firstly for the tip that I can now access GRO certificates for Northern Ireland online for £2. In July 2012 I paid £14 for a copy of the birth certificate of James Magee (1874) purely to get the name of the dwelling place (Derryhirk), having already a copy of the entry in the baptismal register. However, it was interesting to see that James was 7 months old when baptised, an explanation, perhaps, of why Henry paid the priest 4 shillings instead of the basic 2/6.
I think the James Magee junr you mention rented land in the Montiaghs. Henry seems to have used the land purchase Acts to become owner of that land and the holding in Derryhirk. Henry's father was named James and I'll view the death certificate you mentioned.
I had found that the death of a Henry Magee was registered in Lurgan RD in the September quarter 1910 but Magee is a more common surname than Dargan is in Northern Ireland and at the time I was reluctant to chance £14. Thanks to you, I know this must be the right person and I need spend only £2 to see the details.
My second thank-you relates to the fact that I would never have thought of searching for a will, thus revealing the drawback of preconceived ideas about people.
So thank you very much for your help. I have had 2 visits to Northern Ireland, where I'm assuming you live. I spent 10 days based in Belfast in 2009 and a further week this summer. I found people unfailingly helpful and friendly.
Shelagh