Warner Brothers Studio - early shuttle bus?

[volingaround]

Hi,

I'm taking my son to the Harry Potter tour for his birthday tomorrow and have tickets booked for 9:30am. It says the shuttle buses from Watford Junction start running at 9:20 - is this in line with the 9:30am tour or will there be an earlier bus running? It says they have buses from 8:15 but I can't find a timetable for those and am having a quiet panic about it!

Thanks in advance :)

We got on a regular bus when we went mid October during October break. Can't remember bus number but we got off a five minute walk from the studios. Found it much quieter than the shuttle bus.

Hope your DS had a good time.