...having had a look at the DT90 instructions, it seems logical.
To be sure, though, I'd want to check the wiring instructions for the existing thermostat though to ensure you've identified the live and switched live wires correctly.
(My, simple click room thermostat is double-insulated - no earth - but has 4 potential connections - neutral and live, and make when rise and make when fall - only the make when fall being used).
In general use, I've never worried at all about accuracy, simply set it at an offset that represents the desired temperature, and forget the numbers on the dial.
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