Hi Mark and welcome

Are you looking for Bidmeads generally, or to trace your own line of Bidmeads back?
If the latter you'll need to note down what you know of the family as a starting point. Was your father born 15 Oct 1916 in Reading*, married your mum 1950, died north London 1996?
*If so, his parents were:
Stephen Thomas Bidmead (born Maidenhead 1883, died Hendon 1967 aged 84), and
Florence Ada nee Watkins (born Hampshire 11 Oct 1881, died Hendon 1970)
...who married in Henley in 1907. They appeared with him in Hendon in the 1946 electoral roll and were still in Hendon (30 Goldsmith Ave, NW9) in 1965.