Looking for Joan Roberts

Hi I am looking for Joan Grace Darling Roberts,Born at Hayes Middlesex UK D.O.B 28 sept 1928 give a year one way or the other, Married at registry office in about 1948 then became Mrs Joan Churton. Died at Coffs Harbour Hospital,New South Wales, Australia we think in may 2001
Joan was my Mother and I am hopeing that if her birth cert or something can be found I might find out, about her parents not sure at all what their christian names where which is really holding me back with the search Mum told me that one of them came from cornwall and the other came from the Isle of wight also that one of them was born in a lighthouse,thats all I know.apart that they both lived in Garston Watford UK before they died