Sovereign ride on Knackered?

We require some advice!!!!
We have a sovereign 90cm ride on mower which has the following problems; (My wife today hit a man hole cover!!!!!)
1) One of the two blades are bent,
2) The steel driveshaft that drives the bent blade is also bent
3) The Aluminium bearing casing for the above driveshaft is fractured
4) The aluminium section that the blade bolts to is also fractured
and just to take the p*** the brakes are going!!
The mower is 7 years old - is it a write off or is there somewhere I can get the above bits?
Thanks for any help you can provide
Stu