1cm long, there are a few, younger/smaller look more translucent. Think its some kind of beetle?
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Sorry, I can't quite see enough detail in the photos to be sure what this is, but if it had three pairs of legs at the front that would make it a beetle rather than a fly. I see from your comment in the Invertebrates forum that this larva was preying on aphids, so I suppose a ladybird larva is the most likely solution. (Hoverfly larvae also eat aphids and can look a bit like this but don't have legs.)
Entomologist and biological recorder
This seems to be widest at the abdominal end rather than the front, which suggests not ladybird to me. Another option is lacewing larva, and I think the colouring matches quite well for some of the green species... so that would be my guess, if pushed.
Does not look like a lacewing, IMO.
Lat/Lng: 51.4, -0.3
OS grid ref: TQ2375