Reverse bulb/s

[aj1]

Hiya guys and girls. Keep getting the warning for right reverse bulbs. So jot off down to halfords. New bulbs, and I put them in. Brake light fixed and rear sidelight fixed. However the reverse one still cones up. So I get home and change it again. And still comes up with right reverse bulb. So handbrake on, put it in reverse (auto) and have a look. Both aren't working. Could this be a fuse issue or am I looking further inward??

[Steve Q]

I'm suspecting a wiring issue as reverse lights will take signal.from.thengearbox when reverse is engaged