Today TLM managed to poo in her potty twice, and did not poo anywhere inappropriate all day. She was rewarded with a bowl of ice cream each time. Normally, if the desired poo-thang happens, then it seems to be just a coincidence. This afternoon was the first time that she announced her impending poo and willingly deposited it in the right place.
While there is every likelihood of her backtracking once her routine becomes disrupted (i.e. with the changes in childcare arrangements), this is a major toilet-training milestone for me.