Feeling really confused about fire rated downlighters. We need 26 for our extension which is part flat ceiling and part vaulted ceiling. It's an L-shaped kitchen/diner/family room. Have received opposing advice. Builder says just use Screwfix LAP fixed integral LED downlights. One electrician says adjustable downlights are a waste of money and to go for the integral Enlite ones and another says we should go for adjustable Enlite but ones that don't have the integrated bulb. There's a BIG price difference between these options so naturally I want to make sure I'm spending my money wisely. Can anyone give me some insight on this? Thank you