Don,t worry he will get there, children all take different tme to do things. I would certainly go to pull ups though and do your same routine and one day the pull up will be dry. I have 5 children and 2 of mine did day and night in no time at all, but 1 took until she was 5 to be dry at night.
But always tell your son it doesn't matter about wet times and praise him loads for dry times and he will feel alot better in himself.
Good luck!

Hi Ang,

Thanks for your email.

He'll be in pull ups tonight and we'll see what happens.

San