So 1mm is fine. Would it be bad if I was to go with 1.5mm
Not at all. Only issue is with some fittings that struggle to take 1.5mm, but it is not uncommon for lights to be wired in 1.5mm for fixed circuits, even though 1mm is allowed.
 
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Title
Question about cable and security light
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UK Electrical Forum
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Daz134,
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MFS Electrical,
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