Thanks for your Flook info - it does largely tie up with what I have and extends it a bit.Any connection with my Flooks must be in the generation before my great great great grandfather, Benjamin Flook (married to Sarah Martin) which I think would be the same as the generation before your William Flook married to Hester Strong.
I don't have any information about Benjamins parents at the moment.
I do have a list of Flooks from the 1851 census who have to be either brothers and sisters or at least cousins to Benjamin, with their addresses, but this doesn't help much. There are no Williams.
I will check out my paperwork further to see if there is something I have missed.