Hi Deano,put the machine on a cycle and as it is washing ,open the door.It will stop as there is a microswitch in the door.When you open the door,look to see if the arms are still rotating.If the water is just bubbling out of the arms,you will need a new wash pump.This is a major job and will cost with labour about £220.If the lower arm rotates but the top one does not,see if the grey tube that runs up the back is loose in the plate at the bottom.If so re fit,you will need a part called a COVER,this is about £15 plus vat and postage.
All the best.
Foxy
August 2008