It is important to note that protection for the limited company protects just the entity. It does not provide protection for individual clinicians.
While you were a company director, you would have been considered an employee of that company; and you would have ceased to be an employee when you ceased being a director (if not otherwise employed, for example as a practising dentist).
Should legal challenge then be made against the company, the new director(s) would be expected to inform the business’s indemnifier, and if appropriate the claim will be deflected on to the treating clinician.
If you still feel you have liability for the historic risk due the business agreement and transfer of ownership, then you should contact us; however, it would be advisable for you to check with your solicitor before doing so. It is unlikely that MPS would be able to provide protection for risks arising from the transfer of the business.