Hi Carla,
Can't add to that at the moment, Elizabeth TOMLIN was born 1784 Hemel Hempstead, but I don't know where John was born although the 1841 census does show him as born in Hertfordshire and aged 55 (so between 55 and 59 I assume!).
I'll bear your information in mind, and let you know if I find anything in my research.
Jean