Anti-pollution warning after fuse change?

Have a Peugeot 307sw (2.0 HDi 52 plate) and was looking for a blown fuse. I pulled out one in the engine bay but one of the blades pulled out of the fuse breaking it.

I got the blade out, but had to drive to town to get a replacement fuse.On starting the engine, I got an 'Anti-pollution Warning' on the dash and the engine management light on the dashboard.

Thought a new fuse would sort it, but have put one in and it still comes on every time I start the engine.

Could there be something serious wrong from driving it without the fuse? (I doubt it)

Why hasn't the system reset itself with the fuse back in?

How do I reset it myself?

Any responses gratefully received.