On that last one, here's what I wrote previously to someone asking a similar question:
"...the original LPs were issued individually at the same time in the late 1970s as Chapters 1, 2 & 3 on Lightning Records in the UK. All were perfect sound quality in every respect - just like the most famous Joe Gibbs/Errol Thompson production, Culture's 'Two Sevens Clash'. I have since found Chapter 4 on vinyl, but that was put together in the following year and was only available on import - my own copy is a typically dodgy JA pressing.
The albums were put onto 2 CDs much later (mid 1990s?) - Chapters 1 & 2 and Chapters 3 & 4. But I have only seen them advertised on sales lists, never in person. I do occasionally see re-issues/re-presses of the vinyl, but the colours on the covers are washed out, so they are probably pirate copies. I don't take much notice usually (because I have them already!) but if I see them again soon, I will remember you and let you know.
In the same thread, someone else said the vinyl LPs came up regularly on E-Bay and were normally not too expensive.
As for the 7" singles, they've been pushing them out far more recently than 1980! Most of the Joe Gibbs Record Globe JA re-presses these days have "Gold Series" written in small print on the right-hand side of the label. Generally they are undated, but those that do have a year of issue tend to show 1999, 2000 or 2001.