Worth checking the car manual to see if it tells you how to replace the indicator unit - even if you feel it's a bit beyond you, you might know someone who would help? (If you were in London, I would happily do so!) I recently changed the wing mirrors on my car when one was smashed (and the other was a bit broken anyway), and it turned out to be surprisingly easy. There weren't instructions in my manual, but I found them on the internet by googling my car make + model and 'fit new wing mirror', or something like that. There are certainly instructions for fitting indicators online, but I don't know what make your car is.