Dave, 1815 was the year of the Kandyan war with lots of movement of troops from India and Europe by ship, to and from Colombo.
The Caudwell name, with other spellings too, does not show up in any of our military records nor in Civil Servants, Ships Captains nor merchants in Ceylon at that period.
We think the only churches in Colombo in 1815 were St Peter's Fort, and the the Dutch Wolvendaal Church.
St Peters is sadly no more, but the Dutch church records are intact and available on micro film from the LDS. This would only show if the child was baptised, as no birth records were kept and it was not compulsory to register BMD before 1897 in Ceylon.Cheers Larry&Coreen