The Tesco torches really do the business, this evening I could not only see, but have plenty of time to avoid, two potholes that I went through blind last week (twice!), and even in a couple of "black spots" where previous evenings I could see nothing of the road/path at all, I could see enough to avoid twigs and other debris.
Now I'll see if I can track down suitable cable cleats, or might go the whole hog, butcher the torches and make a proper mount.
Btw, two seems to have been a good idea for what I need, one short range, the other pointing more ahead, gave me a good spread of light over a decent area. I'm not cycling fast, mind, and I'd much rather a "proper" solution, but as I'm strapped for cash at the minute, this will do.
Nige