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In the True Spies series award-winning reporter Peter Taylor reveals how the British "Secret State" - MI5 and Special Branch - has spied on citizens for decades, including trade unionists.

But does the personal freedom of each citizen need protecting as carefully as the security of the state itself?

Could there be files on you? Should the "Secret State" have the right to spy on people perceived to be a security threat?

How did Peter Taylor persuade agents, and their handlers, to speak out on camera?

The debate was broadcast on Sunday 10 November at 2200 GMT, immediately after the final episode of True Spies.

You can watch the debate by selecting the link at the top of this page.