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Is this trench functional, as in a 'French Drain'?
If 'Yes', you would be best lining the trench with geotextile to prevent soil particles from (eventually) filling all the gaps between your 10mm aggregate.
The geotextile will also prevent your aggregate just 'sinking' into the soil and (eventually) leaving a shallow, longitudinal deoression the fill effectively collapses over time.
mespilus
musa
Is 10mm gravel ok to backfill a trench? I've already put large rocks and bricks in the base.
I'm probably going to finish with top soil and then weed membrane?