Windley family from Woolwich

[dutch missmarple]

Hi all,

I have a family here originally from Roxwell Essex.
Father Henry (b 1706), wife Ellen (Elleanor) and children Elisha (b 1732) en Ellen (b 1735).
Someone told me they moved to Woolwich Kent, where the following children were born:
Henry (b 1740 d before Dec 1744)
John (b 1742 d 1747)
Henry (b 1744 d 1747)
Sarah (b 1745 d 1747)
Thomas (b 1748)
John (b 1750/51)

My questions:

How can it be proven that they moved from Roxwell Essex to Woolwich Kent before 1741 ? Are there any records somewhere ?

when and where did Henry (b 1740) die ?

and was there some desease in 1747 in England, because they the parents had to bury 3 of their children in 3 days time !

thank you for your time.

Dutch MissMarple