Hi,
Thank you all so much for your help !! Much appreciated

According to Robert's first marriage cert his father was a Newspaper Editor as well.
Thanks for finding Ann Tippen Herbert's and George's details - I haven't been able to find anything on them, apart from their bith dates. Armed with the info you have given I have another avenue to search - thanks again !
Robert did re-marry, 1 year after Margaret's death (she died in 1863, same month as the birth of their 17th child

His children were sent to live with various relatives, including the older brothers and Grace Hyatt. Robert died in 1869 leaving everything to his 2nd wife, there was no mention of his children in the Will.
As a bit of extra information, Robert and Margaret's first son, also called Robert, disappeared after 1851, I can't find any trace of him post the 1851 census.
Thank you all again.
Anna