If the mast service
at Rouen is as good as it seems to be (both from appearances and the reports I've received) then I fear Stephan (at Le Havre) and Frederick (at Honfleur) will see that business decline rapidly.
The key thing is 'keeping the mast up' on the passage
upstream to Rouen (or downstream from it). That stretch of river (not to mention the possible coastal trip round from Le Havre to the river itself) is big - big tides/currents, big ships producing big wakes - and it's far preferable to have the 'stick in the air' in those circumstances.