Ran a Moon Shield on the rear for a number of years. Couldn’t fault it until I got home one day and it wasn’t there. I assume it fell of or the strap snapped. Replaced it with an Exposure TraceR as I couldn’t get the original Moon Shield at a sensible price. Also have an Aldi moon copy on the back set to constant. So yeah make sure you have at least two rear lights.
Sometimes run a blinky light on my helmet as well just to make me a bit more visible in traffic, but that may not be an issue for you if you’re riding down country lanes.
One thing to bear i mind is that your country lanes may be quite winding. So it can be useful to have a high power constant light on the back angled down slightly pointing at the road surface. So even if you’re round a corner then there’s a chance that the driver may see the light on the road, or projected onto the hedges, if you get what I mean.
I also have one of those hi-viz Polaris rucksack covers with reflective sections. When I drive into work in the dark I really notice reflective clothing so would recommend that.