mgf 2001 lambda wire colours

Hi, wondering if anyone could help?.Ive just refitted engine and box on my mgf stepspeed and ive discovered the lambda plug (the post cat one that is fitted into the cat itself) has been pulled off the four wires on the sensor.The 4 wires are 2 x white, 1 x black and 1 x grey.I don't know what colours they should connect to on the wire harness side.HARNESS SIDE IS AS FOLLOWS 1-BLUE/YELLOW 2-blue/red 3-green/black 4-brown/pink. Any help on this would be appreciated

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