Just got back from being on a milk round all night, and have had the misfortune to discover that some little sh*t has ripped one of my mirrors off and, in the process, completely shattered the glass of my driver's side quarterlight. It makes me so unbelievably cross

to think about it it's unreal. I know that if I'd caught them doing it, I probably would have taken to doing something rash, or something which I'd later regret...
It looks like I'm going to have to buy a whole new quarterlight, at a cost of around £50 - which I can't really afford

. Any idea if it's possible/practicable to just replace the pane of glass?
Sorry to go off on a rant, and thanks in advance.