The brand is Mira. I don't see the exact model on the Mira web site but I guess the models have changed over the last 5 years. To the best of my knowledge it's the standard chrome mixer shower. The temp. control is a large round tap. It looks similar to the Mira excel model.
Download the installation instructions which will explain how to check the filters for debris. If they are clear, the most likely fault is the thermostatic cartridge is failing. This is a replaceable item.
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