Exhaust blowing !!!

Good evening all,
Our Micra sport +, is blowing from the joint between the joints for the back box and the pipe to the cat. This looks like a push fit arrangement, with the pipe from the back box over lapping the pipe running from the rear of the cat. It also looks like it is missing a "U" clamp, but there is no evidence that one was ever fitted.
Can anyone please confirm whether or not a "U" clamp should be fitted here and if so what size ?.
Thanks in advance,

Pedro
 
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