As Kev says ?77 is cheap.
A cat would weigh in at 30-40 quid, so you will be hard pushed to find a decent one for between 40-77, If you do you take the risk of it also being fubard.
You could take your car to powerflow or simular to have a new flexi welded in, but i would imagine with the labour and time you wouldnt get much change from ?60.
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