The "shack" is 60 today and although it looks to me like a shed on wheels it is still a beast of a machine:
It was developed by Avro from the Avro Lincoln bomber with a new fuselage and the type is named after the polar explorer Sir Ernest Shackleton.
I have found some great information regarding the Shackleton:
Here's a YouTube clip of the beast in action:
AirSpace - more than just hot air