Wonderful. Those details in the dissertation are fascinating. My husband and I were talking this weekend about what an influx it was and how the whole make up of the town must have changed dramatically, almost overnight. I was going to try to find the population of Tiverton in 1816 because 500 strangers with Leicestershire accents merging with the Devonians with theirs would have been interesting to behold and listen to. It's almost inevitable there was friction. However what shines through as time passes on, especially on the 1861 Tiverton census, was how the prosperity of the town went up.
I posted on the Devon board just now. Hopefully it's still possible to see if those Stevenson children are in the Loughborough baptism records for the Baptist Church. By the way, where was the letter kept you said Tiverton Baptists sent to Loughborough and what was the date?
Cheers.... Vivien