They definitely look like female mosquitoes. In Canada our winters are little colder than in the UK and most adult mosquitoes die after the first hard autumn frost. However, late hatching adults in a number of species do overwinter by crawling into protected hiding places, including cold attics or basements if they can find a way in, and going into a state of torpor. They will also hide under loose bark, for example in a stack of firewood, and we occasional find a few flying around indoors in the dead of winter after hauling in some wood for the wood stove. Cheers. KK

For Cam’s sake I hope they’re midges (which don’t bite). I wouldn’t want all those mosquitoes in my house!