Good find David. It might be worth Susan looking in this area. Colebrook seems to come under Cullompton Parish and certainly Non-Conformists in the area as well so they would need checking
http://www.genuki.org.uk/big/eng/DEV/Cullompton

I've exhausted resources for the Colebrooke Plympton and the Colebrooke Nr Crediton when helping Susan in the past. If I remember correctly I also eliminated almost all the Thomas Tucker's born around the correct time in the above areas. I did send her a few years ago lots of information on who I thought might be possible parents of her Thomas after looking at Cordwainers called William Tucker in the Plymouth area. Although I found baptisms for their children shown on census records could never find them baptising a Thomas Tucker.