#1 Can you stack a tumble dryer on top of this machine
there is no reason why you could not stack a dryer on top this machine.
#2 Is it possible to use the machine to spin only. There is no separate setting for this function but is there any way of setting the machine to do this
Yes - just press the 'spin' button (& adjust the speed) and switch it on. It took me a while too.
#3 Hi, can you wash a double duvet in this machine?
Yes this machine has a duvet setting and it will take a double. the wash load is 8kg.