Alan
Based on the new information that Chris has provided the information we exchanged re the marriage of Florence Caldecott and R E Cording would appear to be wrong.
I have seen a possible birth for Florrie in 1919 and Dorothy in 1920 however they appear to have different mothers 
Births Mar 1920
Caldicott Dorothy C Acford Meriden 6d 1475
Births Jun 1919
Caldicott Florrie Brookes Birmingham 6d 330
I have chosen that Dorothy going by what Chris says about her remarrying a Mr Donohue. There is a Dorothy Caroline A Donohue that dies in 2001 in Rugby. the problem is the death registration says she was born 4 May 1914 - but that could be wrong
Why?
I am not giving up on this one (JW - Harper) just yet. Going off what Chris has posted and not stating a birth year for Florrie, I still have hopes on this one!
*(where did you spot UR Florrie 1919?) see mine later.
Being as Dorothy may have misled with her stated age on the marr cert (21) and Chris gives a specific date for her birth in 1920 (7 years out) and making her 28 when married, it may be interesting to see the stated age of dorothy on the 2nd m cert when she married Billy.
IF what Chris says is true, and I have no reason to think otherwise - Ridiculous as this sounds - what chance a Florrie being born 4 years earlier than Dorothy - in 1916?
If this is acceptable - although I cannot yet find Dorothy, I can find Florrie (only the one) using an open search on Free BMD once again, and Florrie Caldecott is b 1916 with a HARPER as mother, which is roughly where I began my journey after you had fed me JW.
I currently still think that you got this right, I am playing devils advocate in order to disprove this connection, still with CORDING involved from 1914-16 right up to JW in Ashton.
Oh ye of little faith - in your own findings

Seriously though what do you think?
Alan