Our client writes:

"A final update regarding my LED flickering. The issue has
returned, but I have been given a reason and a solution that may be of
interest to you. The bulbs are fitted in a new-build house and it has a
PME (protective multiple earthing) system. It has been explained to me
that when my light switches are operated, only the 'live' wire is
disconnected; the neutral is left connected and an EMF (electromagnetic
field) is generated and picked up by the capacitors in the LEDs,
causing flickering - there is no power in the neutral, only an EMF. The
solution is to change the switches so that both the neutral and live
wires are 'cut' when the switch is operated. This situation has occured
because building regulations only dictate that a standard wiring system
be installed at the build stage, and 'new specification installations'
(namely my LED bulbs) are not catered for.  I have
decided to tolerate the flickering as it is not all the time and will
hopefully not affect the longevity of them. A bit lengthy, but I wanted
you to have the explanation as it will (in my view) occur more and
more, and it may be worth indicating that a simple change of light
switch may be required with some bulbs. Anyway, I am still delighted
with your product. Regards - VT."