Clouded footman

A very hairy caterpillar about 16mm long. Had blotchy cream and grey markings on the back against a black background. There were tufts of long back bristles rising from raised knobs on every segment and tufts of shorter bristles along the sides. There were prominent bright reddish orange protuberances along the sides which also had tufts of bristles.
The head was well tucked under so I could not study it.