Wearing the most popular colour of the season, Kate Middleton, Duchess of Cambridge, spent Valentine's Day, last Friday, working with her Art Room charity — she is the patron — at Northolt High School in Ealing in West London. For the occasion she was dressed in LK Bennett, one of her favourite high street stores, and definitely a good choice for charity work. It seems inappropriate to wear designer clobber when on a charity day.

The dress is called the Detroit Dress and has a cool notched collar detail, into a defined waist and a length that goes to just under the knee. All terribly appropriate and regal. And of course it is completely sold out — within an hour of her appearance in it. The Kate Effect continues.

I actually really like this on Kate. It is young and modern and reasonably within what a happening thirty-something woman would wear to a work function. I also like her attitude as ever. Enthusiastic, joyful and fully involved with the people and tasks at hand. This is one of her most admirable qualities.

I must also mention that her hair is also absolutely fine here. Not over-styled with silly curls, just blown out and natural. Good girl.