Try Chipsaway - they can give you a quote and go from there to see if it is viable.
0800 028 7878 will put you in touch with your local guy if you give them your postcode.
it probably is worth repairing as trying to loosen the bolts for the front pipe may be difficult. Have soaked the threads for a few weeks but concerned about snapping them off and the following problems if I do.
looking for the cheapest option to repair the flexi part on the downpipe to the cat n a defender 90. What o/d is the front pipe also?
Also poss side exit exhaust after centre box.