Here's a 'get-you-out-of-trouble', plastic, mirror panel. Size 125mm x 200mm x 0.7mm thick.
Flexible and easy to cut with a craft knife or scissors.
It is supplied with a removable protective film and three double-sided adhesive pads.
Just cut to shape and stick it over the top of your broken mirror glass.
MIRROR GLASS REPAIR KIT #MIREP