You do not seem to be sure of Robert's date of birth ! There is a big difference between 1969 and 1992 !!!
This is from the births index, on Ancestry.
To see the details you need to order the certificate at 9,25£
see online www.gro.gov.uk
with the details below.
They may refuse to send it because it is less than 50 years old. Try it.
Robert Jones Thompson Oct-Nov-Dec 1966 Croydon London
Name: Robert Jones Thompson
Mother's Maiden Surname: Fyfs
Date of Registration: Oct-Nov-Dec 1966
Registration district: Croydon
Inferred County: London
Volume Number: 5a
Page Number: 1256