Blue Peter Special Assignment is a factual BBC TV series broadcast in the 1970s and early 1980s, the first spin-off from the long running BBC series Blue Peter. It ran regularly from 1973 until 1981, usually at weekends on BBC1, and was heavily promoted on Blue Peter itself. The concept for the series was developed after Valerie Singleton had presented a successful documentary 'special' with HRH Princess Anne when she had visited Kenya in 1971. The Special Assignment series was mainly produced by Edward Barnes and presented initially by Valerie Singleton and later by Peter Purves and Lesley Judd both of whom had been presenters on Blue Peter itself.