I would have said that most of us around that time would have gone to clubs (and Youth clubs) and had both feet in both camps.
When I was a young Mod (then Skinhead, Then Suedehead, Then Mod again) Soul music and Reggae were played and enjoyed (and danced to) side by side.
A typical playlist might include:
Young Gifted And Black
You Can Get It If You Really Want
Wonderful World, Beautiful People
The Ten Commandments
Love Of The Common People
54 46 Was My Number
Skinhead Moon Stomp (+ Must Catch A Train)
Wreck a Pum Pum
You Got Soul
Al Capone
Long Shot Kick De Bucket
Israelites
Big Five
Pinkney Gal
And these would rub shoulders, seamlessly, alongside
Needle In A Haystack
I Got A Feeling
Going To A Happening
Heaven Must Have Sent You
Help Me
I'm Gonna Miss You
Everybody's Going To A Love In
The Cheater
I Got What It Takes
I'll Always Love You etc.
Even those 'Soul Fans / Mods' who understood the distinction would still dance to and collect Reggae alongside Soul.
Most of my mates collected and appreciated both Soul & Reggae in equal parts and I've still got all of the above in my collection from that time. Not 'Reggae Hardcore' I know, but very much a part of my youth.
So as far as ACTIVE interaction between scenes goes, I'd say that (at least up north) they were one and the same.
Sean Hampsey