Solve the puzzle below: the solution is a number.

The prizes have now been won, but all correct solvers will be added to our roll of honour!

On Harry Beck's masterpiece, go green from Manet's reclining nude in a South and Easterly knight's move. Count in dark blue to where you might burn a gardening implement. Multiply this by the Easterly red count to where the High Stone gives XI to Epping but XV to Ongar. Add the Greek sages. Divide by the sweet red planet's beat. Count the resultant letter up to the end of the first of four stanzas in Blake's NIMBY protest poem. Add next prime up to the letter count to finish.