By James Davey LONDON (Reuters) -Associated British Foods said underlying sales growth slowed at its Primark clothing business in the Christmas quarter, hurt by unseasonal warm weather at the start of the period. The group also said on Tuesday it was monitoring the situation in the Red Sea but does not expect any significant disruption to its supply chain for now. Primark’s like-for-like sales rose 2.1% in the 16 weeks to Jan. 6, its fiscal first quarter, a slowdown from growth of 8% in the previous quarter. Primark’s total sales were up 7.9%. “It was a tricky period,” Finance Director Eoin To…