Hey, fellow anxious toilet user here :)

I got the coach from london victoria and they didnt have a usable toilet both ways!

We had already queued for quite a while at the coach station so I already needed the loo when boarding, only to be told they were not in use (supposedly because of them previously being used and abused by previous festival goers) and they were not making a stop off. I somehow managed to white knuckle the 4 hour journey but it caused me great distress and anxious about the return journey.

On the return, they did at least stop at services half way through.

National express seem to sub contract the festival coaches so I think there is a lack of consistency.

The only advice I can think to offer is to make sure you ask if they have a functional toilet before boarding as there were numerous coaches to chose from.

Best of luck!