I dont ever recall being asked to broadcast runway surface conditions on the ATIS other than when snow, ice or freezing fog were current weather conditions. With the UK weather as temperamental as it is, if I had to put "damp/damp/damp" out every time it actually was, then we'd never land or depart anything, cos the griptester would be permanently out on the runway!
BTW, we only broadcast runway surface conditions via ATIS when requested to by the Airport Operator (BAA).