I want to reduce my brow bone and need to know cost for surgery and days fully needed to recover?

Brow reduction can be done with small incisions with endoscopic assistance.  I don't know of a surgeon in the UK who does this.  See a few surgeons and ask about their technique and if they do endoscopic approaches.  Best wishes.

With the permission of your parent, yes, you should  seek doctors who offer surgeries that can shave the forehead. These are often plastic surgeons or maxillofacial surgeons.  

Forehead forehead reduction surgery can indeed be done. It is certainly not the case that you would need any kind of special Imaging unless you have an unusual history such as trauma or prior surgery to the area. Endoscopic reduction of the brow bone should not be done except for the very rare...