Hi don’t know if anyone can help me! Basically I took my car in to a garage and they have said that there is a rattle from the flexi joint and that to resolve this they would need to replace the whole Catalytic Converter as the flexi pipe and cat comes as one joined part! Is this correct?

Find yourself a proper exhaust specialist, if the pipe itself is in good enough condition a new flexi section could be welded in. 

I agree with that one, my last car's cat broke it's mounting arm so when I accelerated harsh there was a thud underneath the car from the cat banging on the underbody.

Main dealer said that it needed a new front section and cat as they were one piece. Quoted around 350 if I remember.

Took it to a local autowelder who had a look and charged me £40 to weld the arm back on. Lasted me until I moved the car on.

Many places now just want to replace, they don't want to or are incapable of repairing items like this.

Thanks for that I’ll check that out! Not actually sure on the condition of the pipe itself, they’ve quoted me £500 to replace and fit a new cat.