EMC Compliance

[Lincoln Fong]

Someone mentioned the 'CE' mark with reference to interference/compliance. I
have a question for you manufacturers and kit sellers with ref to this mark:
If I'm going into business selling a small cased battery powered (9 volt
type) unit or effect with no oscillator or HF inside and fairly immune to
external interference, does sale to the public still require the display of
this mark in the UK,US and or elsewhere and if so, from what I read, is a
sort of honour system involved? Ie do you mark the product and register
compliance with an authority (if so whom?). Further if you don't mark the
product what happens? Is your product going to have trouble being accepted
by outlets even if electromagnetically speaking it's harmless?

Any answers appreciated.

Lincoln