Article says it's treated 19,000 people since 1989. If 1000 clients join the action, does that mean....
The 1,000 number is speculation. The 19,000 appears to be total referrals, which have been running at over 2,000 per year since 2016.
From the interim Cass report we have sketchy data from GIDS:
3.12. In 2019, GIDS reported that about 200 children and young people from a referral base of 2,500 were referred on to the endocrine pathway. There is no published data on how the other children and young people from this referral baseline were managed, for example if: their gender dysphoria was resolved; they were still being assessed or receiving ongoing psychological support and input; they were not eligible for puberty blockers due to age; they were referred to endocrine services at a later stage; they were transferred to adult services; or they accessed private services.
If we accept that 200/2500 ratio, that would mean only 1520 total given drugs "directly", which would make 1000 claimants seem a very high target.
But I think a lot of the remaining 17500 could well have a cause for complaint - not getting good treatment for their actual problems because of the over-emphasis on "gender identity", "affirmation" and discussion of drugs.
Part of TullipR's claim is that he felt pushed into agreeing to the drugs to get continued attention. There are likely many more who got stuck into some sort of holding pattern where they weren't agreeing to physical treatment, but were still attending the clinic hoping for help with their mental health issues, and not getting what they needed. I think they could form part of the claim base.