No. Most 'money purchase' (DC) schemes are not 'occupational' schemes in the legal sense. Instead they are 'group stakeholder' arrangements or 'group personal pensions'. Legally, these work in the same way as personal pensions: they are set up and managed by the provider (usually a big insurance company) and the employer may have no role other than to choose the provider and send the employee contributions.
The Pensions Regulator thinks it is a good idea for employers to be more actively involved in managing their workplace schemes. You may want to find out if your employer has set up a management committee for your DC scheme. There is guidance for employers on 'monitoring your pension scheme' (PDF) from the Pensions Regulator.