Corflute signs are often used for temporary advertising and are made of a type of plastic called polypropylene. One way to dispose of them is to recycle them at a facility that accepts polypropylene. You can check with your local recycling facility to see if they accept polypropylene and how to properly prepare the corflute signs for recycling.
Another option is to reuse the corflute signs if they are still in good condition. For example, you could use them to make new signs or use them as a temporary barrier or partition. If the signs are no longer usable, they can be thrown away in the trash. However, it is important to dispose of them responsibly and in accordance with local laws and regulations.