Hi @mahonyson,
Yes we used the legacy skin before updating. We updated to the latest version of Neve 3.5.5. and then some custom pages broke . After we installed the plugin All Bootstrap Blocks the custom pages worked and nedeed just some tiny custom css updates.
I think you can also use any other Bootstrap plugin. Just go to Intall new plugin and search for bootstrap and try.
I understand this is not the best solution, but it did what we wanted.
Good luck !