Thanks again Potato, found the rule you quoted regarding clasified stakes
139.1 All weight allowances for a horse are cumulative unless otherwise specified.
139.2 Fillies and mares shall, unless the Authority directs otherwise, receive the following allowances
139.2.1 5lb in respect of a flat race which is not a flat Pattern Race, is not a flat Classified Stakes or is not a Rating Related Maiden Race;
139.2.2 3lb in respect of a flat Pattern Race;