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OK, so 1 ad on T2 - as it should be for L sericata. I am hopeful that I have cracked this species. Certainly my local ones seem to consistently show the following characters, all of which are pretty easy to see, even in photos:

1. Creamy yellow basicosta (most other species dark).
2. A single anterodorsal seta on the middle tibia.
3. A wide frons, with the frontal vitta being about twice the width of the fronto-orbital plates.
4. 3 post sutural acrostichal setae.
5. Orange palps.
6. Long first flagellomere, at least 4 times as long as wide.

The above are listed in more or less the order I would look for them to build up a case for sericata. In addition you could check for conspicuous dusting on the abdomen, which if you get just the right angle often has an obvious median line; and I notice that Whitworth mentions a small ocellular triangle in the females, not reaching half way to the lunule.

L sericata is by far my most common local species, and I suspect one of the easiest to key out. The caveat I would add to my observations is that I have been looking almost exclusively at specimens from my local area ie east London and the Thames Estuary. I have not had a chance to look at any manky old museum specimens or any French specimens yet.