Shared equity in HA property?

[Graciescotland]

I think I could scrape together the money to buy a 25% share in a HA flat that's advertised. Can anyone who's bought a bit of equity in a Housing association house advise as to the process. Do you have to be on their waiting list etc.

Is there a contact number on their advertisement? They must be able to help with that sort of advice. Good luck with it!