Flat or jumps, it’s become increasingly rare to see small trainers win big races. Sure, that trend was bucked at Cheltenham last month but, even with all the shock results there, Willie Mullins won 10 of the 28 races, more than all of the British trainers combined.Will it be the same in the Grand National at Aintree next Saturday? Willie Mullins certainly goes there with a strong hand, as does perennial champion owner J.P. McManus.