Caterpillar ID please

Any ideas please what these are? Flattish, bit jelly like but move like a caterpillar.
In my daughter’s garden so I haven’t seen them.

In my daughter’s garden so I haven’t seen them.

Gardening on the wild, windy west side of Dartmoor.
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I've found them, Hover Fly larvae.
You’d never imagine in your wildest dreams that they could turn into a hover fly, would you?