I was out at work Murry so all I got was the fallout but I snapped up the DVD ASAP.
To be fair it wasn't a hoax, it was billed as a drama, was the final play in a drama strand, featured well known bit part actors as the 'real' people but even when you know that it's still bizarrely effective.
Other British telly scares of yesteryear include,
And naturally if you want to be really weirded out in terms of a series get Sapphire & Steel.