gayford
The requiement to illuminate of at least one wind direction indicator (wind sock, wind sleeve) on specified categories of aerodrome is not new. The recent change in CAP 168 removes the prescribed configuration for light source, i.e. it used to be the overhead four arms with a lamp on the end of each arm; the currnet requirement is much more flexible:
"The illuminated wind sleeve shall be lighted by methods so that it is fit for purpose..."
Mister B