Excellent find. So he's gone from 12-4 but at 2.18 SH texts about the memory cards arriving. Strange. I hope Beckys dad and step other can remember the times, or CCTV's available.
Also if hes finished his shopping at 12.51 theres a missing 3 hours till he returns at 4. That would be the ideal time to use the saw yet going by his story Becky's body is just left in the bag in his house till later that night when he moves it to the bath. Also he hasn't bought all the rubble bags and cling film "packaging" at that point. I hope they can track his phone from 1pm to 3pm that day.