About an inch long, and semi-translucent. It was found in the laundry basket, and could either have come from indoors or outdoors around here (Oxford) or may have travelled back in a suitcase from Nigeria in the last six weeks, with clothes I've recently washed. About 10 pairs of stubby legs and a row of thorn-like spikes down each side of the back.
This is the larva of the Hornet Mimic Hoverfly, Volucella zonaria. The larvae of this large and impressive fly live and feed within the nests of social wasps more usually those of subterraneous nesting species. Some larvae (not sure if all) appear to leave the wasps nest to pupate so there is more than likely an abandoned wasps nest in the vicinity of your laundry basket.