Hello Barry, it seems the majority of new washing machines have sealed outer drums now. The symptoms you describe are classic drum bearing failure. The brown rust marks at the back are caused by water leaking into the bearings through the drum bearing seal. In my experience Hotpoint have always had rubbish drum bearing seals. Drum bearing failure has always been a very common issue. I would never buy a Whirlpool, Hotpoint or Indesit appliance. To be honest, there are very few of the common brands I would buy.