mot failure or not

I need some help please this is just a one off post, my car has failed the mot on something really minor happy days.
Upon sorting it i found the front anti roll bar mount has gone and the rusty chassis leg is now holding the anti roll bar and it looks pretty bad. I consider myself to know a little bit and my neighbor more so.
He said its shocking that this was not picked up especially as the movement in the wheel is quite special.
Now i have fixed the failure point were do i stand as my car is clearly not road worthy should i take it back and have it passed i dont know what to as i would say to rectify would be quite costly.
Any advice gratefully recieved.