I'm trying to remove the exhaust heatshield under the fuel tank just in front of the rear beam. It's attached with these w*nky plastic screw things and when you turn them they don't un-thread.

Is there a secret technique to removing these?

Any quick answers would be much appreciated as the car is on axle stands and I would rather it didn't remain so for too much longer.

Cheers.
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You feed beefburgers to swans.

I may have been speeding Mr Policeman but [a] I live for the 306 and [b] did you see that dog? omfg