Many thanks for hte help in 'monitoring no change' especially Jim.
Now my Friend has another problem, it is to randomly switch on one
led of a stack  of 6 (to 10) leds for a short period  and then to
light another (could be same one), continuing so that all leds are
lit after a while, but with no obvious sequencing of Leds being lit,
this is to continue indefinately, with no obvious long term pattern.
Many thanks for all help
Andrew Farrar and Terry Hobell