Where the appropriate committee or the Commission are consulted under the preceding paragraph, and on any such grounds as are mentioned in that paragraph they have reason to think that they may have to advise the licensing authority that the product licence ought to be suspended, revoked or varied, the committee or Commission shall notify the holder of the licence accordingly, and, before giving any such advice to the licensing authority, shall afford to him an opportunity of appearing before and being heard by them, or of making representations in writing to them with respect to those grounds.