I've definitely got a distinct memory of buying Brotherhood from either John Menzies or WHSmith, but basically they're the same shop in my town. After Menzies closed, WHSmith opened in the same building. I think the latter purchased the former. Wikipedia states this happened in 1998, but I'm pretty sure our branch changed prior to that. Probably about 1990, I think. Around about the time that I bought the tape.
So, copies of Brotherhood certainly got out to shops other than Woolies, even if they weren't meant to. Maybe they were timed exclusives when first sold, but by 1990, anyone could see them.
I do think, though, that I probably bought one of my tapes from Woolies. Movement maybe (my Low Life and Substance are both second-hand, whilst Movement and Brotherhood were bought new, I think).
I also remember that that Menzies/Smiths shop had a beat up copy of Low Life. I was thinking of buying it, but it was so tatty, I decided against it.
I've also got multiple copies of Substance on tape. Three to be precise.
When I first got into the band, a mate of mine gave me his copy on tape. As he called it, it was on 'permanent loan' to me. It had a slipcase but was pretty battered by the time I got it (I think he must've sat on it as it wasn't old when he leant it to me; it was still 1987).
After playing it multiple times, tape 2 got shredded by my player.
I then went out and bought another copy.
This also had the slipcase, but were different tapes to the above. I can't remember which one is which now (my tapes aren't to hand) but one set of tapes was made of clear plastic, whilst the other set was made of black plastic.
My third copy (the linen box) was bought a few years later, second-hand.