I am a Kesterton researcher; my latest updated Kesterton database located at http://kesterton.atspace.comhttp://kesterton.atspace.com shows the Kesterton-Frewing marriage index listing (from ECR). The subsequent years for births, which list the mother's surname, show no Frewing event.It is likely that Henry and Barbara had no UK descendants. Henry shows a birth entry for 1893, making him age 44 when married.There is no death entry for him as far as 1988.Barbara also shows no death entry nor re-marriage entry.They probably left the country just before the war. If you acquire his birth certificate, and can connect him to the Henry Kesterton - Ellen Knight parents, then you might locate someone in the large Group 1 Kesterton structure, which Henry K and Ellen Knight are part of.
Hope this helps.My database is still being updated, as I catch up with lost time. -- David Kesterton