MaytAsko
Congratulations on your new washer Richard - hope its not a big issue, have never experienced the play in the drum so cant offer a solution at the moment, dont have a schematic either to see how the drum, arm and spider all fit together to see if tightening the back nut is a solution, I would contact UK Whitegoods guys in the morning sending the video as an attachment and see what they would suggest....they have much experience with these machines as they sell Askos as their ISE brand!!
Mike