It’s a selco one, manual is [here](https://www.selcobw.com/media/files/CS354950005%20Product%20Guide_v7.pdf?srsltid=AfmBOoqihYK26MorUriNUMPCov1kFkB4w3kHNUVik2IPR99ffw8lbM4u)
This is a programmer. It is a timer that sets when the central heating and hot water (the presence of which suggests your boiler is not a combi) will be allowed to come on. It does not override the thermostat.
Looks to be very similar to mine
https://preview.redd.it/j3ztabu8545h1.jpeg?width=4032&format=pjpg&auto=webp&s=8a5e36a48e2a14bfb7dba1adb054499f1c912d0a
Looks to be very similar to mine
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