Estimates on output shaft seal replacement.

[tomo9700]

So after getting my a8 back on the road and sorted for the mot (except the fuel pump) today was the day. Turned up at the mot station and put her on the ramp. 10 minutes later the mechanic comes out and says "whats on fire" had smoke pouring from the cat so was obviously refused. I knew it was leaking but i didnt think it was that bad. So what prices has everyome been charged to get theres replaced? Can anyome recomened anybody in the stockport area? I may end up selling yet, £1000 anyone?