I think Lisa Dawson is wrong.
From the Advertising Standards Authority (ASA) blog:
"What is influencer marketing?
Influencer marketing is a technique that has evolved alongside the rise of social media and modern technology.
It involves brands engaging with figures popular on social networks such as YouTube, Facebook, Twitter and Instagram, to discuss, photograph, recommend and sometimes just insert themselves into conversations about a product.
Sometimes these engagements are authentic in nature and the “influencer” may just be posting a genuine opinion. In such cases, these posts are not considered ads.
However when the brand has control over the content of the post and rewards the influencer with a payment, free gift, or other perk, the post becomes an ad. If the commercial intent isn't clear from the overall context of the communication, it should be labelled as an ad so as not to break the ASA’s rules and mislead the influencer's audience.
Consumers should always be aware when they are being advertised to. Failure to disclose the commercial relationship an influencer may leave a brand at risk of a complaint to the ASA."
www.asa.org.uk/news/online-influencers-is-it-an-ad.html
And the actual guidelines:
www.asa.org.uk/advice-online/affiliate-marketing.html
And a really clear, simplified summary - NB. disclosure should be at the TOP of a post and gifts should be disclosed as gifts:
www.4psmarketing.com/blog/new-asa-guidelines-simplified/