Ruby Wax says the "f-word", London Mayor Sadiq Khan tells men to cut it out and supermodel puppets made from pre-loved clothes strut their stuff on the catwalk.

March was quite a month for purpose-powered ad campaigns.

But which were the standout ads from last month? Well, as part of a monthly round-up of the best brand purpose campaigns of the month, here are our five picks.

Enjoy!

5. Walkers & Comic Relief

Campaign: Cut Out The F-Word

It's time to talk about the "F-word". No, not that one, the other one - "fine". Sure, it may be less sweary, but that doesn't mean it's any less offensive. After all, nothing good has ever come of the word "fine". In fact, in the UK, the average Brit proclaims they are 'fine' up to 28 times a week - and almost three-quarters say it without thinking about it just because they don't want to be seen as a moaner.

To help Brits share their worries and anxieties with others, crisps brand Walker enlisted the help of TV presenter and mental health campaigner Ruby Wax for an ad campaign for Comic Relief. The result is an amusing ad that's more than just fine.

4. Londor Mayor's Office

Campaign: Have A Word

In the UK, a woman is killed by a man every three days. It's a horrifying stat that London Mayor Sadiq Khan wants to tackle head on. To help get to grips with what he describes as "an epidemic of violence against women and girls, committed by men" in the UK capital, Khan launched an ad campaign that asks men to "have a word with yourself, then your mates".

The ad features a group of lads out on the town. One starts harassing a woman sitting on her own, only for one of the group to step up following a bit of soul-searching. It'll take more than a word to reverse this terrible trend of violence, but hopefully it does make more men step in and be an ally.

3. Nike, Gendercool Project

Campaign: Play It Out

Transgender athletes have been in the news a lot recently, with politicians in the US seeking to create legislation that will restrict their ability to compete.

However, Nike, in partnership with the Gendercool Project, has taken a more positive approach in its "Play It Out" campaign.

Instead of weighing into an already heated debate, the ad campaign - featuring 11 trans and non-binary teens in low-key athletic settings - simply tries to separate the facts from fiction about transgender kids and their connection to athletics. Well worth a watch.

2. Equal Pay Day

Campaign: The Umbilical Cord

Becoming a mother is hugely rewarding, but it does come with its drawbacks. For women, motherhood also means making a lot of personal sacrifices, such as career progression and financial implications.

It's an issue that was beautifully brought to life ahead of Germany's Equal Pay Day (March 7) by a thought-provoking film created by Mortierbrigade.

The ad features various German sports stars, including six-time world champion hammer thrower Kathleen De Wolf, gold medalist pole vaulter Karen Pollefeyt and champion hurdler Vita Van Belleghem, trying to compete, only to be hampered by the symbolic conduit that's attached to their children.

The film really hammers home how women are often held back by motherhood and encourages men to share the load ahead of Equal Pay Day.

1. Vestiaire Collective

Campaign: Introducing the Vestiaire Collective

With models strutting their stuff on catwalks, it may start like any other ad for a fashion brand. But the video "Introducing the Vestiare Collective" is anything but, replacing world famous supermodels with puppets made entirely from pre-loved clothes.

The campaign, created by Droga5 London, is part of the French second-hand fashion brand's new tagline, "Long Live Fashion", and is well worth a second glance.

• Find out more about Good-Loop's purpose-powered ad formats and eco-friendly products designed to reduce advertisers' carbon footprints.