I ordered a copy of Daniel Mortimer's will of 1775, and here is a summary of who is mentioned, in case anybody else is looking for a lead on any Mortimer they may be seeking:
Daniel Mortimer of the Lordship of Tong, Yeoman. Bequeaths to his ELDEST son John dwellinghouses etc in Allerton within Wilsdon for his natural life. But on John's death, they would pass to Daniel's youngest son James AND HIS HEIRS, which would mean that John's son (who I think was a Samuel b 1780) would not have inherited this. Other legatees mentioned, are sons Samuel, Daniel, and Richard, married daughters Mary, wife of Daniel Bateman and Hannah, wife of William Davy and a youngest daughter Martha. James also inherited property at Shelf and Heaton. (Both Martha and James were under 21 at the time of this will).
There was also mentioned other property in Allerton and Wilsdon, which had been previously leased in 1765 to Richard and his heirs. It still seems strange to me that someone who owns several properties couldn't sign his own name, but made his mark. Anyway, I hope there may be something of interest to others contained in this.
Myrrh