When appling brakes, R/B/L (rear brake lights) don't light up. R/B/L do work when headlights are turned on (only 1st stage), but don't light up 2nd stage when brakes are applied. Have checked to see if I have power going to brake peddle switch & all's good. What do I do next. Have checked bulbs and fuses (not 100% sure I checked the right fuses) Under-Bonnet fuse box "No 12" & Interior fuse box "No 32"

Try your 4 way Flashers, walk around the vehicle and which lights work?