Serge Auckland wrote:

As to the counterfeit components, as far as I
know this only affected the "boutique" brands which for marketing reasons
would consider fitting "designer" capacitors.

WRONG.

It affected the really cheap Chinese 'no name' brands and was AFAIK restricted
to low-ESR types intended for use with switching power supplies. It also
apparently only affects the larger capacitance values, although this may simply
be a consequence of the applications in which the larger values are typically
used (power supply).

See badcaps.net for example.

Graham