most Corlett entries in the IGI have been affected by such replacements - having checked them against the actual entries there are significant number of erroneous entries some seem totally mythical though I suspect incorrect parish, errors in dates etc - in marriages often any 'als' information has been lost - some are just total misreads though the funniest I seen is in Ballaugh - some deluded patron has replaced (+ invented a few) jo(h)n Cowley + mary SLANSKOGGLE entries - the middle european name came from a misreading of scrondle miln! in a couple of entries - some others I suspect derive from similar delusions