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Lewis,
I'm not a sparky but if it's a modern safety switch, they do require current to work.
They work by detecting a "loss" of electricity in the circuit. The theory being that if electricity is passing through a person to the ground, that electricity is "lost", the safety switch detects this and breaks the circuit.
The test button simply leaks some current to the Earth, otherwise it wouldn't be a real test.
To find if there's power to the board you can wave a stud finder in front of it and listen for the inducted 50hz hum.
Best bet is to call a sparky.
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