Woe, woe and thrice woe. Just got back in the car, started the engine and about 10 seconds later a sound like an old tyre blowing and the rear end dropped lower than a snake's belly. Initially I thought just the offside but the nearside dropped as well. I don't think it's one airbag, seems more likely to be a hose broke or come loose. Opinions welcome. The car is 13 years old.