Update:
We finally managed a day out
DS did not sleep in the buggy
However, he stayed in it lying down and resting for about 1 hour before I let him out again
He had a fun day and didn't show any signs of being tired, until he nodded off in the car on the way home for 20min
I put him down for an EBT and let him nap an extra 45min the following day, which I don't think he needed tbh!
He's been happy and showed no-ill effects or temperment issues from the missed nap.
Now he's nearly 2yo he seems to be doing better on a 1-3pm nap, so I'm shifting him to that from 12.30 - 2.30. He's still STTN from 7pm - 7.45am pretty much. And yes, I know how lucky we are!!
We're off on holiday for 4 days to the Isle of Wight the week after his birthday, so I'm more confident we can go out and do more things now