I am looking to see if anyone can identify attached spiders. I have found about 8 of these spiders in my shed and tend to come out at night. From picture I have seen they look like false widow. But unsure.
Fear not, this is Nuctenea umbratica also known as the walnut orb-weaver spider. They emerge at night to sit in their orb webs but tuck themselves away in cracks and gaps during the day, aided by the somewhat flattened body shape. Quite commonly seen on wooden fences, sheds etc.
They are one of the few UK species recorded as being able to puncture human skin with the bite if sufficiently provoked:
but it evidently hasn't caused the hysteria-prone elements of the media to make a fuss.
Well I've never been bitten by one, and am no toxicology expert, so I can only go by the link content, which suggests that the effect of the venom seems on a par with say a wasp sting, although individual reactions vary I guess.
From what I've read bites from UK spiders are rare and usually happen when the spider has found itself trapped inside someone's clothing or bedding and thus feels threatened with imminent physical danger, or is being handled roughly enough to provoke the same reaction. From my observation these ones don't wander about much and I've never found one in the house despite plenty being nearby in the garden, where they seem to tuck themselves away by day very effectively.
A bit more about spider bites in general (and from false widows specifically) here:
Hope that helps.