A famous American horse-handler – after seeing an English trainer who had been his assistant starting to win races back in the UK – declared: ‘I taught him everything he knows.’ He then added: ‘But not everything I know.’ With a friendly but intense end-of-season battle this year for the Jump Trainers’ Championship between Paul Nicholls and his former assistant Dan Skelton, I suspect that Paul is secretly hoping that he too has retained an edge despite their successful years together.