20. The provisions of this Part, other than Article 24, apply to catering waste (other than used cooking oil) whether processed or unprocessed which—
(a)contains or has been in contact with animal carcases, parts of animal carcases (including blood) or products of animal origin (other than milk or milk products, eggs, rennet, gelatine or melted fat which have been incorporated into another product); or
(b)originates from any premises where any animal carcases, parts of animal carcases or products of animal origin (with the exceptions referred to in sub-paragraph (a), are handled or where foodstuffs containing or coming into contact with any of the same are prepared or produced.