Doesn't look like anyone's seen this but Moriaty have said they're also supporting in exeter.
https://twitter.com/Moriatysounds
If that's true and doors are at 7 then muse almost certainly won't be playing more than an hour and a half. I'm guessing:
Doors- 7
Moriaty- 7:30-8
Marmozets- 8:30-9
Muse- 9:30-11
Weird that no other venues seem to have a second support too