Variegated Carpet Beetle - Anthrenus Verbasci
Common in the UK, the adult beetle is about 2-3 mm long and shaped like a ladybird. The adults feed only on pollen and nectar. The larvae, around 5mm long and covered in short bristles, eat animal protein, wool, leather carpets and clothing.
The female lays eggs on a suitable protein source, often an old birds nest where the larvae feed on droppings and feathers. The larvae grows , moulting 4-5 times before pupating in the final larval skin. When hatched the adults will fly in search of pollen, often found on a window ledge looking to make their escape. They return to buildings in the autumn to lay eggs.
Control is with good housekeeping and residual insecticide sprays or dusts.