Hi guys,

Thank you for your suggestions.  I have managed to get my whole script to 
execute in under 10 seconds by changing the 'for loop' I posted above to the 
following:-

for opco in Cn:
        for service in Cn[opco]:
                ack = set(Cn[opco][service]['RECV']) & set(Pr['13'])
                for jarid in ack:
                        Cn[opco][service].setdefault('ACK', set()).add(jarid)
                nack = set(Cn[opco][service]['RECV']) & set(Pr['14'])
                for jarid in nack:
                        Cn[opco][service].setdefault('NACK', set()).add(jarid)
                retry = set(Cn[opco][service]['RECV']) & set(Pr['504'])
                for jarid in retry:
                        Cn[opco][service].setdefault('RETRY', set()).add(jarid)
                retry1 = set(Cn[opco][service]['RECV']) & set(Pr['505'])
                for jarid in retry1:
                        Cn[opco][service].setdefault('RETRY', set()).add(jarid)

The script is by no means complete and I will be looking at your suggestions 
more closely to adapt my script accordingly based on your suggestions.

But for now I am happy to have dramatically speed up the execution of my script 
from over 20 mins to under 10 secs!

Thanks again for your time.
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