This is being opposed by Scotland for Decrim an org made up of past and active sex workers:
https://scotlandfordecrim.org/
The Nordic Model (what Regan is proposing) is also opposed by Amnesty Int, The World Health Org, Human Rights Watch, UNAIDS, Freedom United (an int. anti-slavery org), PICUM (org re the rights and safety of migrants in Europe), GAATW (Global Alliance against Traffic in Women), HIV Scotland, Scotland for Decrim and other sex worker orgs such as Scottish based Scot-Pep.
https://decrimnow.org.uk/open-letter-on-the-nordic-model/
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In 2022 Belgium became the first European country to pass complete decriminalisation (the model all the above support), showing that the Nordic Model isn't the only "modern" option to discuss.
Also going to leave this here. Since N.Ireland passed the Nordic Model back in 2015 (very easily given the power and support from their Church) there has been one conviction of paying for sex in a decade. Yes, one (sentence was a donation of their own choice to the court). Turns out it's very difficult to enforce and sexworkers are not willing to snitch on their clients. Unless you want cameras installed in every sex worker's bedroom it's very difficult to enforce (and very expensive attempting to as well).
I see AR also wants a 6 month prison sentence for this, well good luck for that too since Scottish (and Britain as a whole) prisons are bursting at the seams and prisons are needing to let prisoners out early.
"Ash Regan on fire here."
She hasn't always been top of her game and has been the subject of ridicule on the topic...