 Bernard Lovell joined the radar team at the personal suggestion of P.M.S. Blackett , an original member of the Tizard Committee . He arrived at Dundee and met Sidney Jefferson , who told him he had been transferred to the AI group . The conditions at Perth were so crude that it was clearly affecting work , and Lovell decided to write to Blackett about it on 14 October . Among many concerns , he noted that ; 
