Thanks Netty - yes I think he is. There seems to be some confusion over the exact surname this branch are using - sometimes Perkins is a middle name, others a surname.
According to additional research I did, Robert Nigel Perkins CORY m 1965 to Vivienne N LOAKE, and with her had a son and dau: Nicola Caroline P CORY (b 1967) and Jonathan Andrew C P CORY (b 1970), who go by Nikki and Andrew respectively.
Reference to grandchildren piqued my interest as there could be a further heir in remainder if there is a son of Andrew.
Nicola m. 2001 Nigel MACLEAN, and had issue: 2 daus (born 2003/2005)
Jonathan A C PERKINS CORY m. 2005 Joanne M MARSTON. Cannot track births after 2005 on Ancestry, but careful checking of the GRO indices (which do not give mother's maiden name for entries in the last 100 years), suggest two daus (born 2006/2009, both in Kettering which matches Electoral Roll locations).