Looks like some type of ichneumon wasp. They are predatory wasps that lay their eggs in other insect’s larvae. There are over 25,000 known species of Ichneumonidae…
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Never seen them in UK I found it in my bedroom flying about
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yep, that’s a good friend to have around. As @oldmarine said, it’s a predatory species to BAD bugs in your cannabis grow. If you see those (wasp types), or ladybugs, or preying mantis, you WANT them to be there. They are hanging out because they KNOW there are BAD bugs there and they will HELP rid you of them 
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No big in my grow room at all it was in my bedroom so I guess it flew in yeaterday
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it’s just that i was JUSSSSSST reading up on these wasps, and preying mantises, lacewings, piratebugs, nematodes, etc because my OUTdoor ladies, MIGHT have a stem boring caterpillar in one of them… I have FOUND preying mantises hanging out on a different plant in a different location outside and after reading it SAYS specifically they came because they could smell the feces and larvae of the BAD bugs. Same with the wasps 
Nature is pretty wild. It said the caterpillars and other bugs they eat (like aphids) have developed “defense” mechanisms too to where they’ll purposefully eat poisonous vegetation even for their own demise, just to keep the wasp larvae from living in them as their host and for preservation of their larvae once deposited. It’s a cat/mouse game in nature with bad bugs and beneficial predatory bugs that eat them
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