Hemerobius humulinus
A very common species which mainly flies from April to September.
The presence of a recurrent humeral vein and 3-4 branches to the radial vein helps separate Hemerobius from Psectra and Micromus, and the position of veing RMCV (inside the fork of vein M) helps to rule out Wesmaelius. However, note that vein RMCV is often unpigmented in Hemerobius so you may need to look really carefully for this and it might not show up in photos.
As far as I know this species cannot be identified with certainty without seeing the tip of the abdomen. Although Hemeobius lutescens tends to have have less dark in the wing there is quite a bit of variation within both species. See the FSC AIDGAP guide (Plant, 1997) for details of how to separate humulinus from lutescens by the tip of their abdomens, but in due course I'll try to take some photos of the relevant bits and add them here.
, Lolly Moor, 31-Aug-16.jpg)
female Hemerobius humulinus, Lolly Moor (Norfolk, UK), 31st August 2016
, North Elmham, 7-Apr-19.jpg)
female Hemerobius humulinus, North Elmham (Norfolk, UK), 7th April 2019
, Foulden Common, 9-Apr-17.JPG)
male Hemerobius humulinus, Foulden Common (Norfolk, UK), 9th April 2017
, North Elmham, 19-Jul-16 (A) (1).JPG)
, North Elmham, 19-Jul-16 (A) (2).JPG)
male Hemerobius humulinus, North Elmham (Norfolk, UK), 19th July 2016
, North Elmham, 28-Jun-19.jpg)
male Hemerobius humulinus, North Elmham (Norfolk, UK), 28th June 2019
, North Elmham, 8-Jun-17.JPG)
male Hemerobius humulinus, North Elmham (Norfolk, UK), 8th June 2017
, Elmham churchyard, 16-Jul-21 (A) (2).jpg)
female Hemerobius humulinus, St Mary's churchyard, North Elmham (Norfolk, UK), 16th July 2021
, Cathedral Meadows, 16-Sep-20.jpg)
female Hemerobius humulinus, North Elmham Cathedral Meadows (Norfolk, UK), 16th September 2020
, North Elmham, 11-Aug-18.jpg)
female Hemerobius humulinus, North Elmham (Norfolk, UK), 11th August 2018
, North Elmham, 29-Jul-17 (B).JPG)
, North Elmham, 29-Jul-17 (A).JPG)
2x female Hemerobius humulinus, North Elmham (Norfolk, UK), 29th July 2017
, North Elmham, 15-Aug-18.jpg)
female Hemerobius humulinus, North Elmham (Norfolk, UK), 15th August 2018
, North Elmham, 7-Aug-18.jpg)
female Hemerobius humulinus, North Elmham (Norfolk, UK), 7th August 2018
, North Elmham, 7-Sep-19.jpg)
female Hemerobius humulinus, North Elmham (Norfolk, UK), 7th September 2019
, Burnham Overy, 2-May-17 (A) (1).JPG)
male Hemerobius humulinus, Burnham Overy (Norfolk, UK), 2nd May 2017
, Dillington Carr, 1-Sep-21.jpg)
male Hemerobius humulinus, Dillington Carr (Norfolk, UK), 1st September 2021
, Dillington Carr, 2-Aug-21 (A) (2).jpg)
male Hemerobius humulinus, Dillington Carr (Norfolk, UK), 2nd August 2021
, Marsham Heath, 1-Sep-16 (A) (2).JPG)
male Hemerobius humulinus, Marsham Heath (Norfolk, UK), 1st September 2016
, North Elmham, 1-Jul-18.JPG)
male Hemerobius humulinus, North Elmham (Norfolk, UK), 1st July 2018
, North Elmham, 12-Jun-17.JPG)
male Hemerobius humulinus, North Elmham (Norfolk, UK), 12th June 2017
, North Elmham, 15-May-21 (A) (1).jpg)
, North Elmham, 15-May-21 (A) (2).jpg)
male Hemerobius humulinus, North Elmham (Norfolk, UK), 15th May 2021
, North Elmham, 20-Aug-18.jpg)
male Hemerobius humulinus, North Elmham (Norfolk, UK), 20th August 2018
, North Elmham, 21-May-16 (A) (2).JPG)
, North Elmham, 21-May-16 (A) (1).JPG)
male Hemerobius humulinus, North Elmham (Norfolk, UK), 20th August 2018
, North Elmham, 25-Jul-19.jpg)
male Hemerobius humulinus, North Elmham (Norfolk, UK), 25th July 2019
, North Elmham, 4-Aug-20.jpg)
male Hemerobius humulinus, North Elmham (Norfolk, UK), 4th August 2020
, North Elmham, 7-Sep-16.JPG)
male Hemerobius humulinus, North Elmham (Norfolk, UK), 7th September 2016
 (2).JPG)
Hemerobius humulinus, Hockham Heath (Norfolk, UK), 23rd April 2016
, North Elmham, 20-Jul-18.jpg)
male Hemerobius humulinus, North Elmham (Norfolk, UK), 20th July 2018
, North Elmham, 21-Aug-20.jpg)
male Hemerobius humulinus, North Elmham (Norfolk, UK), 21st August 2020
, North Elmham, 12-Aug-20.jpg)
female Hemerobius humulinus, North Elmham (Norfolk, UK), 12th August 2020