You’ve got a marriage on this site for George William Warburton (my grandpa’s brother) and Jane Colt.
I’m sure your transcription is correct - the GRO index also has her name as Colt, but I think it should be COLK.
Their two daughters were both registered with MMN Colk, as was Jane’s birth in 1909.
1911 census has her listed as Jinney Colk living with her father Albert. His burial (on this site) is also in the name Colk.
Perhaps you could add a small note?