Dave,
Not everyone thought that way though did they Keith?

Yes they did because it was the case. People like Owen put themselves at a competitive disadvantage by treating workers decently.
Only legislation like the Factory Act forced the bosses to be nicer.

Jim,
"There never was slave labour here, "
WHAT!!!!
UTTER MADNESS

Fact not madness Jim.
Opening statement on your link, "Slavery in Great Britain existed and was recognised from before the Roman occupation until the 12th century, when chattel slavery disappeared after the Norman Conquest. Former slaves merged into the larger body of serfs in Britain and no longer were recognized separately in law or custom."