Samantha Cameron showcased another election campaign outfit this morning, firming up her position as the most stylish of the politician's partners. 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 Cameron, wearing an £185 Hampton dress in emerald green from The Fold, supports husband David as he launches the Conservative Party's manifesto in Swindon . A vision in green: Sam Cam (centre) adds a dash of glamour as she applauds her husband while seated between George Osborne (right) and William Hague (left) All smiles: Samantha laughs at one of the Prime Minister's more jovial points . Sam Cam, 43, a huge fan of British designers, showed her commitment to UK brands once again by plumping for the Hampton dress. The midi dress with cap sleeves and narrow V-neck is made from a non-crease poly twill fabric, perfect for a woman travelling a lot - and a busy mother-of-four. The look was finished with a slim white belt to accentuate Samantha's enviable waistline and a pair of black heels. The company behind the frock has a flagship store in Clerkenwell and was founded by Polly McMaster. The label specialises in contemporary work-wear. Their collection is designed with 'modern, professional women in mind' which makes them an ideal fit for Sam Cam. Other celebrity fans include Davina McCall and Amanda Holden. Liking what they hear: George and Samantha look happy with their man . Wearing green but thinking blue: Samantha stands out against the Tory suits . Sam, who appeared to have caught some Easter sun, showed off tanned legs and arms, but kept her make-up simple with some subtle berry lipstick. Jewellery was a pair of gold hoops and a slim gold chain bracelet. The Prime Minister's wife recently showcased another element of her style - her taste in interiors, as a series of pictures of the Cameron's kitchen dining room were released, along with their 1950s retro-chic sofas and chairs and a funky steel lamp stretching over the table. Promises: Mr Cameron took to the lectern to talk about the Tory party's intentions including doubling free childcare for working parents . Listening intently: Samantha looked comfortable in her emerald green wrap dress . Today, she sat, the proverbial rose between two thorns, next to George Osborne and William Hague, listening intently as her husband took to the stage to outline his party's key policies ahead of the general election on May 7. In launching his manifesto, Mr Cameron promised voters 'the good life' as he vowed to double free childcare for working parents and guarantee workers on the minimum wage will never pay income tax. David had Sam's full attention and she only paused to smile, exchange some knowing looks with the Chancellor and to applaud. She also laughed heartily to the PM's jokes and smiled broadly at other times, although occasionally pausing to adjust her long bob. After the speech was over she and her husband left hand in hand, with Sam almost appearing to lead Dave. View from the back: David and Samantha make their way out of the venue . Smiling into the sunshine: Holding hands, the Prime Minister and his wife leave the conference at the University Technical Colleges in Swindon . A wave to the crowds: David and Samantha look happy after launching the manifesto . A helping hand: The PM shows his chivalrous side as he helped his wife get into a waiting car . During the speech, Cameron claimed Britain is 'on the brink of something special' as he unveiled a cradle-to-grave Conservative manifesto, promising voters 'security at every stage of your life'. The Prime Minister warned there is 'almost nothing without economic security' as he set out an extension of Margaret Thatcher's hugely popular Right to Buy scheme, vowed to scrap inheritance tax on homes worth up to £1million and promised to freeze rail fares for five years. While the audience cheered these plans, Samantha's sartorial choices were also a clear success. Her latest appearance on the campaign trail comes after a MailOnline poll found that if the electorate were voting for wives of politicians, they'd put her at the top of the tree. The latest Populus survey saw the Conservatives and Labour tied on 33 per cent, but if Mrs Cameron went up against Justine Miliband she surges to 38 per cent with Labour on 30 per cent. A new Populus poll for MailOnline asked how people would vote if (left to right) Samantha Cameron, Miriam Clegg, Justine Miliband and Kirsten Farage were leaders instead of their husbands . If wives ruled the world: The Tories would have an 8-point lead over Labour if the women replaced their husbands as leader, a Populus poll for MailOnline reveals . Senior Tories have described Mrs Cameron as their ‘secret weapon’ and her appearances on the campaign trail dominated coverage in the days after the election was called. The poll asked voters which party they would vote for if the women were the leaders instead of their husbands. Mrs Cameron came out on top with 38 per cent, with Mrs Miliband on 30 per cent. Some 21 per cent said they would back Miriam Clegg, much higher than 8 per cent currently enjoyed by husband Nick in the same survey. Just 11 per cent of people said they would vote for Ukip if Nigel Farage’s wife Kirsten was leader. Mrs Farage keeps a much lower profile that the other leaders’ wives, with both Mrs Clegg and Mrs Miliband making regular appearances in the media and on the campaign trail.
Sam Cam accompanied the PM to the launch of his party's manifesto .
Samantha looked at ease in the £185 emerald green wrap Hampton dress .
The designer behind the frock is British fashion company The Fold .
Amanda Holden and Davina McCall are also fans of the work-wear brand .