Hi there and thanks for replying and taking the time to read my very long post! The thing is I'm only home until 12.15 before I have to go again to collect my other son from pre school. Then when we get home I have less than an hour before I have to go again to collect my other son from school. So we are all not back home again until 2pm.
Just thinking out loud here. What about moving BT later and getting morning WU later so that he wakes just in time for a quick feed and out to school run, being less tired during school run to (FX) stay awake for the entire run and go to his cot back at home for a proper sleep where he can more likely transition for a full nap?
So, maybe something like (I'll just put a 2.5hr A time because you'll be moving towards this over the coming weeks):
WU 8am
E 8
A 2.5
S 10.30 - 12 (at home in cot)
E 12 (if this isn't enough time to feed then make WU and nap a bit earlier but not so early that he naps in the car or can't make it back home in time for the next nap at home in his cot, say 15 mins earlier something like that)
A 2.5
S 2.30 - 4.00 (at home in cot)
A 2
CN 6 - 6.30 (this would drop when A reaches 3hr)
A 2
BT 8.30pm
then as you move to 2 naps around 6 months it might look like:
WU 7
A 3
S 10 - 12
A 3
S 3-4.30
A 2.5/3
BT 7/7.30
What do you think?