The Pensions Service will tell you from your NI contribution record for each year of employement who the employer was and whether you were contracted-in or contracted out from the Government scheme.
If you were contracted-in, it means that all your pension from that employment accrues from the various Government schemes (Graduated Pension, SERPS or S2P as appropriate, depending on the year).
It is only if you were contracted-out into a company pension scheme that you would have an entitlement to a company (one or more) pension element.