I quite often suggest to parents when to start potty training as spending a lot of time with the child, I am nearly always aware of when they need to start.
I introduce it very low key, potties, book etc, and then have a couple of days and see how it goes, and then send them home for the weekend and ask parents to continue. I ban pull ups, but use Bambino Mio training pants to save the carpet, they are really soft, look just like pants and you can get them in pink, white and blue, Wilkos is the cheapest
I have just trained one mindie, she is just 2, it was fairly easy, we had a couple of poo accidents to start, but once she understood the feeling and sensation, plus a few chocolate buttons, we cracked it. She is also came dry at night after 2 weeks.
Now I have a 20 month old telling me when to change her, so she is next in line!
Great not to have a huge sack of dirty nappies that is only collected once a fortnight!