the prime minister 's wife showed her support of uk business by sporting a thoroughly british outfit at the conservative party 's manifesto launch in swindon .
wearing a simple but elegant £ 185 emerald green wrap dress by london-based designer the fold , mrs cameron looked every inch the first lady of british politics as she arrived at the town 's university technical colleges .
winning in the style stakes : samantha laughs at one of the prime minister 's more jovial points .