Thank you, I've just found this nugget of information, that echos what you're saying....
When will the full lineup be revealed?
While the initial poster includes around 100 acts, the festival plays host to many more than that.
In total there are around 700 solo artists, bands and DJs who play on a mix of 80 stages over the course of the festival.
The full lineup and set times are usually released at the end of May, which is when ticket holders can scroll through the seemingly endless list of acts and start planning who they want to see.
In 2016 it was released on May 31 and in 2017 it was on May 30