The provision of open tops on the 78/508 has been rather hit and miss this year.
Far, far, far more miss than hit I'd say, if bustimes is any judge. I'm a regular visitor to the area, and things weren't great in autumn 2023, and were far worse in autumn 2024. Now it seems to be almost non-existent.
I had a look at the vehicles that have been in use in recent years on the 78 and 508.
17490 (Denis Trident, registered in October 2001 so 24 years old this year) was regularly on the 78 but it's MOT expired 21 March.
17692 (Denis Trident, registered in December 2000 so already 24 years old) was regularly on the 508, but has no MOT either as that expired 19 April.
Well that's two vehicles that can't be used out of the three, which leaves 19161. That's an Enviro4000. Registered in 2007 so positively young and spritely in comparison to the others. Good news! It passed it's MOT this March! But it's not been on the road since 16 April.
It looks like there are plans to improve this. A spare open top from the Peak Sightseer (16943) has transfered for the 78 but it appears as unreliable as the other open tops. I think it's first day out was Sunday and I saw it broken down in Keswick for most of the day.
Registered in March 2006 so a mere 19 years old... If bustimes is to be believed, it managed a few journeys on 3 May, and one journey on 5 May.
Perhaps this suggests the problem. Knackered, ancient buses on routes that are hardly easy drives. The 78 runs 8am to 8pm every day. It's a bouncy, windy road with loads of ups and downs. It's a great ride. A fantastic route for an open top service. But the only time you appear to be able to reliably predict an open top will come arrive is during winter when spare 599 vehicles get used.
Strongly suspect the reality is that they need to put a few pounds in and convert a bus that's a little newer. These are supposed to be flagship tourist routes, and they're not even getting buses in the Lakes Connection livery.
So, in short, it's anyone guess what will be running!
One thing I'd assume about what's running. It will have a full roof.