Thanks Frances
I thought I remembered seeing St Marks records on the site a few years ago. [I did check my info at the Museum but it is useful to get clues online for your quest]. I have now found yet another Kewley [John b Onchan Sept 1803] and as usual with my Kewley relations he appears to have disappeared of the face of the earth too. That's why I wondered which other burial grounds were missing from Brian's lists.
Thanks for your help