Hi Suzie and welcome to BW boards
Your routine looks pretty good to me.
Answers to your questions.
[quoteShould I be getting him up at 830am even though he is tired or is this ok?]
If you want to get on the 8.30am wake up for the day and 8.30pm bed for the night, I would get him up at 8.30am no putting him back to bed for a sleep after you feed.
This means he can oversleep - should I leave him asleep or wake at the next eat time to keep the schedule on time?
Wake him up so you can get his next feed on time to keep to the EASY.
I am not happy with the late bedtime and would like to bring this forward to at least 830pm - how can I achieve this? - is it likely to affect his wakeup time as I would prefer to keep this around 830am
You can bring this forward to 8.30pm, as long as you get him up and ready for the day at 8.30am, his inner clock will work to this time in a few days.
For the last feed, I feed Josh in bed in dim room and he gets v.drowsy almost asleep (I am breastfeeding). I normally try to rouse him slightly when I put him in the cot and often he has eyes open when I leave the room but then drifts off soon after - is this ok or should I be adding something extra to bed routine to separate feed/sleep. At this point he is v.tired and not interested in playing.
No, this is perfect how it stands. As long as you not breastfeeding to sleep, and he is awake when he goes down in his cot, this means he has learnt independent sleep, and not relying on you to send him off to sleep.
As Josh is now 4 months old should I be moving to a 4 hour routine? He appears to be tired after 1.5hours awake - yawning/fussing etc. so not sure he can handle 2 hours awake although could probably go 3.5hours between feeds. I have no idea about how to structure the routine to adapt to 3.5hour or 4 hour as I want to keep the bedtime the same or earlier.
I would follow the 3.5hr routine. My DD could only keep awake for 1.5hrs at a time. So we did the 3.5hr EASY till she was 6 months, then as she started to be awake a little more I moved her on to the 4hr EASY.
You could follow this routine (roughly)
8.30am Wake and Eat
10am Sleep for 1.30hrs
12noon Wake and eat
1.30pm Sleep for 1.30 - 2hrs
3.30pm Wake and eat
5.00-5.15pm Sleep for 1.30hrs
6.45pm Wake and eat
7.30pm bath
8.00pm Eat (top up)
8.30pm Sleep.
If you have any more questions please ask.
HTH