Here's the reply I got ..posting for others who are looking for this answer from UKBA....
Reply: NAT 541 - RE: FAQ POLICY Clarification on how 'spouse application' is treated when making a 'joint application' for naturalisation as citizen POLICY ATTENTION
Nationality Policy Team - Liverpool <
NationalityPolicyTeam.Liverpool@homeoffice.gsi.gov.uk>
Jul 31 (3 days ago)
Dear Sir,
A person applying under s. 6(2) must be married to a British citizen on the date of application, therefore the main applicant would need to have applied and been granted citizenship under 6(1) for s. 6(2) to apply.
I trust this is helpful.
Regards
Ann
Ann Woodall | Nationality Operational Policy| Operational Policy & Rules Unit|Immigration and Border Policy Directorate | Home Office
Blue Zone, 5th Floor, The Capital | Liverpool | L39PP