I recently asked for a second opinion from pediatricians - a particular Dr was recommended and he has agreed to do it.
However, in the interim he has advised:
.....would like to reassure you however, that in the intervening time, stool retention will not cause long-term damage (although stretching occurs with faecal loading, this will settle as X improves).
This is in response to my concerns raised about my son being impacted and having to wait 6 weeks to be seen after an MRI detected 'significant amount of stool' in his bowel.
The above advice sits uncomfortably with me, as I have learned through Eric and other resources long term damage can be caused by sustained impaction / constipation.
(Currently on daily poo - BSC 4 - on 2 sachets Movicol, soiling decreased significantly but increase in day time wetting when my son laughs)