Thank you Ray, Kay and all
The census information provided is correct, including Annie's death date.
As I cannot find a Barnett/Hall marriage 1899+/- 10 years, the BMD marriage provided for William J Hall and Annie 'Jerman' is as you say, a possibility. All I can think is that she married previously and remarried under a different name. I see that the district they potentially married is about an hour's drive away, in today's world, from Charles birthplace. I would have to purchase the marriage certificate.
I have discounted the marriage in Seven Oaks provided in the public tree, which I have seen before but has had some inconsistencies and no verification attached.
Thanks for your time, much appreciated.
Tracey