Looking at his widows death I believe she is
Name: Mrs Patricia Jean Richardson
Gender: Female
Age: 77
Birth Date: 20 Jan 1938
Death Date: 6 May 2015
Last Residence: Morpeth, Northumberland, England
So I'll throw another possibility into the mix
There is a George Richardson who dies in the right registration district for Morpeth - but in Dec 1981 - DOB 5 Sep 1928
This appears to be the George Richardson MMN Campbell reg in Morpeth Dec quarter 1928, he also has a twin brother William
They are living with their parents on the 1939 register (but don't think we are meant to put them up)
There is a marriage between Thomas W Richardson and Ann Campbell in 1927
Really you need George and Patricia's marriage certificate to give the fathers name to help work out which is the correct one