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As well as some Chrysopidae, some hemerobiids also carry trash to camouflage themselves, could this equally be a hemerobiid larva or have you seen some other character which makes this definitely a chrysopid?
You are absolutely right ,I was only going on images that I had seen before .Now i can see hemerobiidae also fit the bill.
Lat/Lng: 51.5742, -0.4286
OS grid ref: TQ089873