Any good toilet training methods for my 3 year old boy? He knows how to tell us if he wants to pee, but when it comes to pooing, he will hide and poo, then tell me with a 'sorry mummy, I pooed'...

Same as my son when he is 4 yr old refuse to go toilet just standing to poo inside the diapers, it took very long time to approach him toilet seat. Just train slowly, he will outgrow when going to pre school.