Jenn,
you are a legend!!!

I feel so ashamed that I dragged my feet on ordering the divorce records myself now.

This is definitely the right Oliver and Ellen. West Monkton is quite a small place and I have a copy of Ellen and Oliver's marriage registration to confirm the details.
These records also confirm that Olive was Evelyn's sister (who died at 28 in Taunton of pneumonia, and is buried 'on the mount' in West Monkton).
Can't wait to hear the juicy adultery details (my family is better than a Mills & Boon

) and a PM is coming your way soon.
Just an aside, in the past couple of days I have talked to my great aunt in NZ and cousins in West Monkton. My grandmother's adoption was a surprise to them, but none of them are upset and some even seem a little excited about it. I will write a few posts in my blog over the next couple of days once i have sorted through the huge backlog of email and work I need to do, since i went away for the Queen's birthday long weekend.
Jenn, how can I repay you?