Brick Walls

Nearly everyone in family history circles come up to a brick wall every now and again. I have reached that point with my great grandfather, John Quarrell Chaplin. I have him on the 1901 census living in Nottingham but I can find no sign of his death in the BMD indexes. Similarly with his father, Thomas, I can find no record of his death.
On a brighter note I have found out a bit more about Mary Yale. The copy of the will of Isabella Fenton ties Mary in to that family as it mentions her as "my daughter, Mary Yale." I have to write off now to the archives in West Yorkshire to see if they have information that might help me.