So. Changed the sidelight bulbs and unfortunately one popped in...

Is there easy way to get it out or should i just let it be there...?

Regards

Take out the headlamp bulb, put a well chewed piece of chewing gum on the end of a coathanger wire and fish it out through the headlamp bulb mounting hole.

rotodiesel.

I was going to mention using a vacumn cleaner with a small rubber tube or a pen and some gaffer tape to reduce the diameter of the hose, using low speed on the hoover, see it if it could suck it out.....maybe it could fish out the chewing gum as well if that fails to do the trick