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Thanks for that ID
Labulla thoracica, although I can not confirm the latter, I was going to suggest that Nailsea might be a little to far north for the spitting spider, as it is normally only found in houses, (and the like), in the UK. Although the further south you go it is reported that it can be found outside under rocks and stones.
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..but.. as you point out, scytodes is a synanthropic species, so it could turn up anywhere..
most northerly record is Carlisle in 1965. (source SRS)
However you missed the point, (just a little), it being the further north it is found it is not like to be found outside.
Sorry about that.
Hold on a minute..
Cheltenham - *Gardens* '91 and '95
Lat/Lng: 51.4337, -2.7624
OS grid ref: ST470707