BBDB completion where real name matches email

[Simon Guest <simon.guest@tesujimath.org>]

Hi Wanderlusters,

Email address completion using BBDB works very nicely, so I can hit
TAB in the To: of the email, and it completes the email.  So

To: sguest<TAB> completes to Simon Guest <sguest@somewhere.org>

But if the email address matches the name, it behaves differently.
e.g.

To: simon.guest<TAB> completes to simon.guest@somewhere.org

and I really want Simon Guest <simon.guest@somewhere.org>

Now this seems to have been deliberately programmed by the Wanderlust
implementers.  Any ideas on how to disable the special function?

cheers,
Simon