The other small ones look like they could be Heather Beetles (Lochmaea suturalis) - see https://www.naturespot.org.uk/species/heather-beetle with a distribution map too.
Looks likely, yes, this was in the Peaks.
@RodSaetan started
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The other small ones look like they could be Heather Beetles (Lochmaea suturalis) - see https://www.naturespot.org.uk/species/heather-beetle with a distribution map too.