This goodreturns article, albeit based on Australian experience, does have something useful to say about the difference between the product provider compliance requirements in the sales process (fundamentally limited to disclosure) and the requirements of advisers.
The problem for advisers is that whether or not something is 'suitable' is nearly always arguable. It is often hard to argue that something was suitable when the manager has gone bust leaving the client with nothing. Yet it may well have been suitable at the time it was sold.
Article by Susan Edmonds at Goodreturns at this link.