Require a new Catalytic converter

I need to replace my Catalytic converter due to acceleration lost on my current Mini One, 1.4, 2007 with 110,000 miles. The acceleration lost pointed to 276A Catalytic converter conversion rate faulty on a generic OBD scanner. Most aftermarket Catalytic converters only last 10,000 miles and are relatively cheap to purchase. However I will like to select a Catalytic converter which last another 100,000 without the Mini price tag. What branding are currently in use which are reliable in the UK?

Please help...