Travis Alabanza's play Overflow is set in the toilet of a club from where transgirl Rosie (Reece Lyons) has locked herself in.

Overflow, Bush Theatre. Photography by Elise Rose. Art direction by Mia Maxwell

She talks about the power of a 'pre-emptive pee' but it isn't just about being organised enough to empty your bladder knowing the facilities, later on, will be less than ideal for a comfort break.

As she talks there is the possibility that she might want to avoid public toilets for reasons other than queues and cleanliness.

The toilet setting is the literal backdrop for stories of her past experiences from primary school to more recent club visits but each is revealing, peppered with revelations about life as a transgirl, how friends and society views her.

At first, the club toilet experience is about acceptance and friendly camaraderie where the girls bolster each other with compliments and rally to help out when one of them is in need.

Rotterdam - Alice McCarthy, Anna Martine Freeman and Ed Eales-White, photo by Hunter Canning

There is a scene in Jon Brittain's Rotterdam when Fiona (Anna Martine Freeman) is on the telephone to her parents. It is New Year's Eve and she is telling them she thinks she's a man. You can't hear what her parents (and grandma) are saying but it is written and performed in a way that you can easily imagine. It is a brilliantly observed - there are aspects of the conversation many people will relate to - and imagined. It is a scene that is funny and tender, it makes you laugh and puts a lump in your throat. And that is everything that is brilliant about Rotterdam as a play in that moment.

It is a play that started life in pub theatre and is now on it's third London transfer (via a stint off-Broadway) and tells the story of lesbian couple Alice (Alice McCarthy) and Fiona who've been together for seven years, living as ex-pats in Rotterdam. We join them the day before New Year's Eve as Alice is plucking up the courage to come out to her parents but Fiona has her own announcement to make. It is reflective of their personalities that while Alice, dithers and over-thinks Fiona blurts and moves forward at a pace like champagne leaving a shaken bottle.

Fiona's brother Josh (Ed Bales-White), who also lives in Rotterdam, takes her decision in his stride and her conversation with her parents is easier than she anticipates, getting accepted as a man and the impact on her relationship with Alice - and how it makes Alice feel about her own sexuality - is less straightforward.