'England, Whose England?' 1973 British Anti-Immigration Documentary

The above is a documentary from 1973, funded by Counterblast Film Fund. From my current research it seems to be the only production they funded, who they were and where the money came from also isn't clear.
For some this documentary may be hard to watch due to racist and anti-immigrant language used by many throughout. However, many of you, like myself, being descended from immigrants, will appreciate this as it provides an insight into the environment in which our parents, grandparents and other loved ones had to contend with.
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