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Whats the switch?!

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spice

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my mate steve handed me this zn1034 timer circuit last thursday, and asked me to make it for him

**broken link removed**

can anyone tell me what the highlighted switch does in the circuit???!
 
Don't quote me on this but it looks like a manual override. Both the output of the timer and the switch are connected to an npn transistor which in turn controls (what I believe to be ) a relay coil with a reverse diode shunt. Ya throw the switch and it applies the pos supply thru a 1K resistor to the transistor base.
 
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