Strong smell of fuel

1.8 ZS completely standard, had new centre and rear box about 5 months ago and was advised at that time that the CAT and flexi pipe was badly corroded and would need changing soon. car started to smell of unburnt fuel and the exhaust was blowing up front, so a couple of weeks ago parted with more cash to have the front half of the exhaust replaced. despite now having had the full system replaced in the last few months the smell of unburnt fuel is still present. any suggestions as to what my be causing this as the wife and kids are finding it unbearable.

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