The only John Moore in Maughold regs buried between 1841 and 1851 was:
John MOORE aged 59, ny Barney, Apr 13 1846.
I am not familiar with the place name "ny Barney".
The correct John Moore burial could be in the Ramsey or Lezayre reg.
Brian, do the 1841 Ramsey census details for them help with his occupation and age? They married in 1837.
The IGI has MARGARET CLARK Christening: 25 NOV 1805 Ramsey, Father: THOMAS CLARK, Mother MARGARET KINRADE [married 1 JUN 1793 Lezayre].
Maughold reg has Thomas CLARK, aged 67, Ramsey, buried Feb 21 1832.
Bruce, who did Catherine marry, and was her marriage in the IOM?