As I read it, the temperature of the fridge section can be adjusted (see page 6 of the manual) but not that of the freezer. That's what I'd expect, given that a freezer should always be set to the absolute lowest temperature that it's possible for it to achieve. https://manuall.co.uk/hotpoint-hbd-5517-w-uk-fridge-freezer/
As I read it, the temperature of the fridge section can be adjusted (see page 6 of the manual) but not that of the freezer. That's what I'd expect, given that a freezer should always be set to the absolute lowest temperature that it's possible for it to achieve.
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