I now have a wonderful hole in a bathroom door, as a result of door-stop not being installed in the proper place, and the door being shoved up against a towel rail (picture attached). As can be seen, this door is of the cheap variety and consists of plywood (right name?) front and back.
My options at this stage are:
- Replace the entire door (expensive);
- Replace the entire back of the door (big job, and possibly pricey);
- Some "localised" fix (ugly, but maybe there's some "magic" of which I'm not aware).
Any advice would be appreciated.

(illustration from