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The thermostat calls for heat from the boiler, it's basically a complicated switch, so no thermostat, no call for heat. If those two wires are the only ones going to the thermostat then it's likely that connecting them together would make the boiler operate. I would carry out some teats for voltage and refer to the boiler installation manual before connecting them, and don't do it live, but a normal household switch could connect/disconnect them. If you don't know much about electrics I would leave it alone though.
Airhead
numpty confession to make re boiler and thermostat...
long story but i removed the thermostat (the wires going into the circuit board at the top into RT) from my boiler and now the radiators don't work (i.e. we have hot water, just no heating to the radiators). have i basically broken the circuit? any idea how to fix this? (the thermostat is currently at the bottom of my black bin outside).