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Actually I think my original diagnosis was too specific. Looked at the picture on my phone and thought I could see the hefty palps of gonatium which are about at the moment and fit the general appearance. Looking at this properly on a monitor, what I thought was palps was actually femur :O
Someone on another site has suggeted "Linyphiidae or Gongylidium Rufipes"
Gongylidium has got both a shiny dark abdomen and orangy legs, it has occured in small number at this point in the year (see the SRS website if you want to check distribution/phrenology here:-
Its another linyphiid. To be honest the darkness of the abdomen is a better fit for your latter suggestion, even if the timing isn't.
I'm going to put a linyphiid id againt it, even then, there are a couple of theridae look-alikes, thought they would normally show either darkened tarsi or a therid comb.
i'll keep my eye out for one when I'm on my collembola hunts in the garden, hopefully get some more diagnostic images.
Cool.. but be warned....like the collembola, there are only a very small minority that can be id'd from photographs with any certainty.
Here's hoping you find a male periscope spider..walckenaeria acuminata.
Lat/Lng: 51.3, -0.8
OS grid ref: SU9057