DS, 4.3-asked to leave nursery at school due to poo issues, what to do , long

[funkypigeon]

Have posted before about DS and the troubles we've been having with trying to get him clean. Bit of background- chronic constipation, has been on movicol now for over a year. Up until 2 months ago would be going all, (numerous, small) poos in his pants. Now doing main one in the toilet with lessening shouting/screaming/crying. Still denies needing to go, and has always got done poo in his pants between getting him trying to hold it in and me actually getting him