As Horrocks laments in his book "Corps Commander", if only he had advanced those 10 extra miles from Antwerp into Holland to Putte to cut off the German's holding the Scheldt Estuary along the Beveland Ismthmus, who would prove so useful 12 days later against the airborne landings, as well as delaying the use of the Scheldt to much needed Liberty ships for 3 months, & extracting a heavy toll in Canadian Commandos. As I pointed out in my "WI Less Effective Deutsche Wochenschau=Shorter WW2?" post, the effect of the SS PK footage of the "1e Englischer Luftlanderdivision Elitetruppen" being shot out of the sky at Arnhem galvanised the German nation no end to resist all the way to Berlin. Without Arnhem, the German September retreat might possibly have turned into a depressed rout.