Yes, a company/ corporate entity can be a company director if it is registered for providing director services as per the Financial Services (Jersey) Law 1998. However, it must be noted that all the directors of that company must be natural persons.
A par value company has the liberty to issue shares which have a nominal value per share, or a "par" value, whereas a no par value company issues shares which don't have a nominal value.
A PCC is a single legal entity. Both the individual cells and the PCC itself can have assets and liabilities that are ring-fenced from each other.