Professor Nicola Spence, Defra Chief Plant Health Officer, said: “I would advise that members of the public living in the South East, Derbyshire and Dorset, avoid any contact with the caterpillar and its nests, as this can cause irritation”.
Article source: https://www.huffingtonpost.co.uk/entry/oak-processionary-caterpillar-moth-uk_uk_6a2806efe4b0d7105b0d1ae4