HH at OKW is the worst, as it's also the last stop for the park buses. The
scooter who was already there when DD and I got there said they'd already watched 4 MK buses go trough, the last couple of which didn't even have the courtesy of saying, "Sorry but I can't get you on."
The 5 of us (the party of 3 with a scooter, and DD and I with a scooter) gave up after the 4th bus had rudely pulled in and pulled straight out again and went round the corner and up the road where we got to the first stop of the park. We were all able to get on there, it being the first stop, and as it happens no other scooters wanted to get on at any of the other stops. We were still an hour late to MK, and we nearly missed our first FP+.
What was interesting was going to the MK bus stand at AoA and me driving straight into the scooter section. There was a bus loading at the time and I commented to DD and OH that we'd have to wait for the next bus. The driver suddenly closed the door and we watched him walk down the bus and kick 3 people out of the scooter spot. I told OH to go and tell him not to do that - I was more than happy to wait as we'd only just got there. He came out, all solicitous and asked whether I was sure I wanted to wait, as he could get me on. I said no. There were a lot of people in the queue and we were in no hurry. He was very thankful and said that when he'd been in the same position earlier, the scooter person had INSISTED on being loaded even though he was already loading 'ordinary' folks. I earned myself a lot of brownie points from the 3 dozen people with kids who were still in the queue and heard everything, especially when he opened up the doors again and got nearly half of them on.
As it happens, a second MK bus pulled in as soon as that one had gone! Needless to say, we got on that one first and then the rest of the queue got on as well.
So, the above is a longwinded way of saying that you can be lucky, or very unlucky. A lot depends how early in the multiple bus stop route you are and how helpful the bus driver is. Funnily enough, we saw quite a few drivers in November that I recognised from our March trip - especially one particular nice chap called Adolph!