I've had a quick search through the uk.d-i-y archives and the net in
general but couldn't find exactly what I want.

I would like to be able to put in an extra wall light switch to
control an existing ceiling light from a different location to the
already-existing conventional wall switch (get that?). I don't want
to have to re-wire, so what I want is to replace the existing switch
with an electronic one that is switchable at the switch (e.g. by
touch) and also switchable by receiving a wireless signal from another
switch placed elsewhere. That other switch would be a stick-on type
that just acts as a "dummy" switch to control the other switch which
in turn controls the ceiling light.

I've seen remote wireless "stick-on" switches that control a plug-in
appliance by way of a 13A plug-in unit into which the appliance plugs,
but not ones that control other wall switches like I want.

Are they out there, and if so, where ?!

Many thanks.
Mike