Regarding the Special Jeep Squadron, they did actually reach the bridge and they did land safely. It took longer than expected for them to form up, the first troop that went to towards the Bridge were ambused, two of the jeeps and all their crews were killed and a further two were rights offs. At this time Urquart was mis-informed, as he is seen to be in the movie (My favourite movie too) that the jeeps hadn't arrived, where as in fact only one was lost on the way in. In the mean time messages were sent out to Gough to report to HQ, so the jeeps came back to the HQ, only to find that Urquart had left and would later go missing. Gough meanwhile, then re-traced Frosts route, and arrived at the Bridge with several jeeps and an ammunition trailer and spent the rest of his time at the bridge until its surrender.