Hotpoint Aquarius Extra WMA 36 doesn't spin & light flashing - help please!?

My Hotpoint Aquarius EXtra WMA36 doesn't manage to spin properly. It seems to think it's unbalanced (although it isn't I've checked) so the red light flashes and although it sounds like its trying hard to spin it never builds up any speed. The drum seems to be more wobbly than it should be too, any advice would be very appreciated :-)

Thankyou, Lisa