Just curious about your thoughts on this: bought a vax blade a year or two ago, only used it few times and now it won't charge when plugged in. Won't turn on when plugged in or out if left to charge for ages (the leds on the unit flash red). I'm guessing it's a dud battery or the charger. New battery is around 60-70 quid which is half the price of the vac. Is there any possibility it could be the charger?