BCC email not working on 5.6.2.1 ?

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I am trying to include emails as BCC with the email helper. However if I use
$mh->bcc
, the email is sent as another 'To' rather than BCC.

$mh->to and $mh->cc works as expected.

I have found one other discussion on this but it dates back a couple of years (http://www.concrete5.org/community/forums/customizing_c5/add-cc-and-bcc-using-c5-mail-helper/#226571) and looking at the Concrete 5 code and API notes (http://www.concrete5.org/api/Concrete5_Helper_Mail.html) this now seems part of the code. However, the discussion ends on this possibly being an environment config, but I can't isolate that as an issue either.

Have spent some time on this and suspect it may be a bug, but it's not reported as one and others must be using it? I'll be grateful if someone could confirm it works for them or not before I register it as a bug.

Dev platform is Windows 7 64, WAMP with PHP 5.4.12 and Apache 2.4.4 if that has any bearing on this.

Thanks in advance.