Nest Thermostat E with Heatlink replacing a Honeywell CM67

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hi I’ve bought a Nest Theromostat E with Heatlink to replace a Honeywell CM67. On removing the old thermostat there are only two wires connected with a third black wire hiding away behind the unit. i assume this isn't connected to anything.

I havn't opened the box yet because its non-refundable as soon as i do. Could someone help with what each of these wires are as they are not labelled so can't confirm if it would be compatible or not.

Photo of current wiring uploaded.
 

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the two existing wires go to com and NO on the nest E , doesnt matter which way round it is just a switch
 
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