I encourage spiders in my house - they have eaten 2 wasps nests over the last 2 years. Lovely.

caveat - this is the UK, and we have friendly spiders. Even big Harry, who lives in the shed and is about 3 1/2 inches across is not even vaguely dangerous to humans
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Rory
MkIIa, blue lit buttons, memory upgrade, 1Tb in Subaru Forester STi
MkII, 240Gb in Mark Lord dock
MkII, 80Gb SSD in dock