Thanks to some amazing help from MargP we have found Michael J Bontoft.
His birth certificate told us that his father was indeed John Bontoft and his mother was Nellie Hall formerly Dawson, his birth details come up as both Hall and Bontoft but when he married he was Michael J Hall.
Sadly we found he has died in 1997 in lincoln as Michael J Hall.
His mother Nellie Dawson married Allan Hall in 1928 in Horncastle, he died in Horncastle in 1943.
Nellie died in 1956 and is buried at Thimbleby.
Thanks for all help given but especially to margP.
Carol