I remember flying back to Gatwick from Hong Kong in 1982. When we left Hong Kong, we knew that that UK had just had a slight covering of snow and the flight went ahead as planned. Again, after the stop-off at Dubai (I think it was) the weather was the same in the UK and we continued onwards.
However, during the latter part of the flight the weather took a turn for the worse in Southern UK with heavy snow blizzads causing havoc. When we got close to Gatwick, the pilot told us that we would need to hold for quite a while whilst the runway was cleared sufficiently to land. He also said that all other airports in the area were having the same problem. 45 mins later the pilot told us that Gatwick were having problems clearing the runway and there was no alternative airport available he now had no other option, due to low fuel, but to attempt a landing at Gatwick. We all had to get into the brace position during the landing, which was a bit bumpy and seemed to take forever to stop, but the guys up front got the plane down wonderfully. A round of applause went around the plane as we taxied in (just like in corney american movies!).