About 3/4mm Very distinct pattern.
No interactions present.
I've been spider hunting again today and I bought back a Th. simile. The pattern, though similar, isn't quite the same. So, I'm still inclined to think this is pictum, though I'm not sure if varians can be ruled out. I'm afraid there's no substitute for examining them under the microscope.
Lat/Lng: 50.728508, -1.752033
OS grid ref: SZ175921
In scrubland adjoining marsh