Get in contact
Every engagement is scoped to the provider, so the useful first step is a short conversation. Email a few lines about your service — roughly how many workers, whether you use agency or bank staff, and what your training records look like today — and you’ll get a reply from someone who works with domiciliary care providers on exactly this.
If something has already happened and you’re working out what to do, say so — those conversations get priority. On timing generally: take advice early.