Guys,
DIS approval through the NICEIC allows you to carry out domestic electrical installations and register them under Part P through oursevles as a registered scheme provider for Part P.
You can issue domestic electrical installation certificates and domestic minor works certificates with the NICEIC approval on them.
Any other work can be carried out by you but you must either issue a green certificate or a certificate based on the model forms from rhe BS7671.
However those scopes of work are outside the remit of your NICEIC approval.
NICman.