The key factor here is the fact it has been standing for six weeks.
I presume the battery needed recharging?
We have to take into account that the car will be now running on factory default ecu settings for fuel and emissions.
Bear in mind that your sensors, injection system and MAF are old and over time will have communicated variable readings to the ECU . Therefore, when back in default mode, the ECU will make the engine run naturally rich thus the high readings.
It,s a tricky situation as the car needs to be driven for it to settle into adjusted settings via the ECU reading the older sensor values etc....
Then, you should find the values regulate and emissions return to nominal values. Unfortunately, that's difficult without an MOT.