what rear lights are recommended ?
Smart R1 or R2, both arround £8-£12, although I think On-One did a phart light which looks identical too so probably the same factory.
Or Blackburn Mars.
I prefer to ziptie one to the back of my helmet too as it’s much more noticable bobbing arround at eye level than on a seatpost covered in crud.
I’ve also got a magicshine rear light that runs off the same 8.4V batteries and a Y-splitter cable, as long as your front light is compatible with the magicshine batteries it’ll work, or you can just cut and splice it into any other front lights cable.
I was tempted to spend more on wire free lights, but in the end as all my riding was on either the SS or the road bike over the winter it’s easier to just fit the lights and wires neatly and zip tie them on, then jus disconect the battery, no more hastle than removing an exposure lamp to charge.