Thanks for your replies. I have seen the IGI detail and I had thought, incorrectly as it's turned out, that Elizabeth's parents were Thomas & Ann but as they weren't born until around 1789 it would make the marriage of Elizabeth & Francis in 1820 highly improbable.
I already have the detail on their daughter, Mary, ch 1823 in Lichfield.
It is possible those you have found on the 1841 Census are the ones but I'm not 100% convinced and need to check further.