Went out and collected all the pieces  of Mrs Builder's wing mirror off the road outside  
A bus hit it ,fortunately she was in the car at the time , wrote down the reg 
the bus stopped round the corner and came back to give his details  
(plus it's all on my CCTV )
phoned the bus company and a manager will call me back tomorrow  
not reported it to insurance YET 
I assume they will pay for the mirror rather than going through insurance (less than £200 for the complete mirror assembly and z157 cover etc i would think) 
sods law , got 3 astra G mirrors , No astra H ones  
Well, over 3 weeks later, an update ....
 several phone calls and emails (all polite ,no threats) to the bus company , I have an email apology and saying the replacement mirror ,painted to the correct ULTRA RARE star silver 3 Z157  

  , with the convex glass shape mirror will be dropped off to me by the assistant manager sometime this weekend  

(I told them I would fit it ,rather than them send a bus mechanic with a
 Brummie screwdriver big hammer and 18" Stillson wrench ) 
the original (repaired by me )glued together mirror is still on and working , 

I gave up hope on the bus company replacing it and ordered another ,which has arrived (in primer ,needs paint ) and to be fair,considering it is not a genuine GM mirror,it is pretty good quality .
also replaced the boot struts on Mrs Builder's estate £14 delivered