Buying shares from other sites

Just had my site 4 £25 accepted :)

ive had a look but i cant see anything concrete about how to purchase shares (when they are available) from other sites. i was hoping to effectively purchase a £25 stake in each site for some comparison and as a bit of a driving force to keep me reviewing the renewables market as a bit of a hobby project.

Can anyone point me to a wait list or similar?

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