Had my first trip of the year on a bus (yes, its not often I'm on a bus) on 1st June. Went to Aira Force, and as it happens the bus back was the same bus and driver 2.5 hours later (after he'd also been to Windermere and back again). Just throwing my tickets away as I'd forgotten to do so for over a week and as the tickets are numbered its interesting to see 69 tickets were sold between the two I had. More than average sold on the rest of the trip since a hen party got on at Pooley Bridge on the way back for a couple of stops so it was a very full bus for that little bit.
On the board at the stop at Aira Force (in the Penrith direction, I didn't look at the other one) it has times of the 508 but not of the 509, but there is a route map showing the 509 there.