...and rear lights at night: Still seeing spots after following a rear light assembly that pulsed extra bright every third flash. The rider turned off at Gaskarth Rd (?), Clapham South to spend the evening crywanking and strangling kittens, probably.
"Don't dazzle, dip" should apply to people on bikes as well as motorists IMO. Especially on a canal towpath, in the daytime. Ffs.