Hi - John Radcliffe was the second John (bapt 1786) mentioned by Constance Radcliffe in her article, and married Jane Kewney in 1814 as Carol wrote. This Radcliffe family from Croggane, Andreas, was CR's husband's family.
MI, Andreas Old Yard: Sacred to the memory of Jane Radcliffe alias Kenney, wife of John Radcliffe, who died the 1st of March 1843, aged 52 years. Also Catharine, daughter of the above, who died the 7th of August 1836, aged 13 years.

John was one of the sons of Charles Radcliffe of Croggane, Andreas (1754-1823) and Jane Sprainger als Christian who married in Lezayre on 21 July 1778 (she d.1803 - will). Jane Christian had married William Sprainger 05 May 1772 - he was buried 1 June 1774, and his will is on Brian Lawson's list along with many of the Radcliffe ones:
www.iomfhs.im/lawsons/LawsonBMD/wills/radcliffe-will.html?Submit=Radcliffe+%26+Variations

I have the children of Charles Radcliffe & Jane Christian as Charles b 1799 d.1852 - will, John b 1780 d 1781, John b 1786 m Jane KEWNEY 1814, William b 1783, Jane b 1785 d 1832 married William Lace CHRISTIAN, Ann b 1792, Caesar b 1793.

Is one of these Radcliffes your ancestor?

Sue