The whole ‘tanks stopping for tea’ thing came about due to US Paratroopers witnessing tanks stopping and making a brew after Nijmegan.
Its easier to push that old myth than look at the real reasons for the halt - Lack of adequate infantry support, ammuntion re-supply and a lack of fuel.
As usual for British soldiers, they brewed tea at every opportunity, regardless of the situation. To Americans this would seem like a sluggish attitude, but to the British Tommy, any respite is time for a brew. My Grandfater stopped several times for a brew during the retreat to Dunkirk and happily used to brew between attacks on his rearguard position. Its just something that the British soldier does, and still does to this day.
Cornelius Ryan placed way too much emphasis on it without really bothering to see the actual reasons for the delay, which would not have made any any difference to the overall plan which was flawed from the outset by Brereton’s insistance that only a single air lift could be performed on Day One, despite several planners and RAF personnel suggesting a two-lift strategy similar to that used successfully on D-Day. This was perfectly feasible and would have allowed the entire 1st Airborne Division to be dropped on Day One.
People love to blame Monty for its failure, but really, other than pushing the idea, he had little to do with the actual planning. The operation itself was an enlarged Operation Comet that had been tabled several weeks previously as an operation for 1st Airborne Div. only.
It was one of those operations that with hindsight is easy to denigrate but at the time it had alot of potential, or at least it seemed that way to those present.
The use of the previously cancelled Comet plans allowed for the short preparation of a massive operation, which given the period was no mean feat.
The German defenders were well known to the planners, but this information was not passed down to the lower chain of command. Frost for instance recalls that had he been informed of the likely opposition, he would have increased the number of PIATs he took and reduced other support weapons in order to carry more A/T weapons.
The German defence also benefitted from having two SS Divisions that had previously trained for anti-airborne operations. This was part of the reason they reacted the way they did, they knew the consequences of what failure would mean for them.
We could go on for days picking over the bones of Market-Garden, pointing out every flaw and mistaken planning, but it was a far closer run thing than many think, and had a few minor events gone the way of the Allies, it could have been very different.