'Les Ecuries' is less than two hours drive from Calais or Boulogne
on the A16 and then (Direction, Abbeville - Rouen) on the
A28 motorway, five minutes from exit 11, Le Pucheil.

They are one hour from Le Havre and Honfleur on the A29 motorway
five minutes from exit 10, St Saens.

Two hours from the D-day beaches.

Half an hour to Dieppe and Rouen.

Crossing the channel
Dover - Calais via the tunnel or the numerous ferry operators.
Dover - Boulogne will cut your journey time considerably.
Newhaven - Dieppe slow, inexpensive but not very reliable.
Portsmouth - Le Havre overnight for an early start. 
Beauvais Airport is an hour's drive from Les Ecuries.