Hi Matt
He's your man!!
On 5th Sep 1950 at the Registrars, Thomas Patrick Buchanan, ages 35 and a bachelor(!!), married Ena Constance Mumby, the divorced wife Harry Holmes.
TPB was living in St. Helier but was born in Belfast. He was the son of John Buchanan, an engineer.
ECM was aged 38 and also living in St. Helier but was from Cleethorpes. Her father was Callis Mundy, a fish merchant.
Witnesses were S. Holmes and I (or possibly V) Webb.
I've done a quick scan of the St Helier deaths from 1948 to 1974 until I found Edna(sic) Buchanan-Holmes death in v76, p75, Mar 1973 to Dec 1974. It could well be I've missed his death or it's in another Parish but it will have to wait until next week.
Stewart