Gary Beadle plays Titus Coventry, a fictional version of Tachowa, in Banksy: The Room in the Elephant. Titus is a failed actor who spots the tank in his darkest hour and finds a sanctuary in it. When he loses this home, all everyone wants to ask him about is the mysterious man who wrote on the side of it.
The real person also turns out to be a lot more of an eccentric than his fictional counterpart, although we see him too question how Wainwright can write the story without ever having met him. He gets his answer when he's taken to the Edinburgh Fringe to see Beadle perform in the play, which has him in tears (and the trip provides him with a new eccentric outfit for rollerblading around Venice Beach.) Having seen another take on the character in the previous hour it's easy to remember that Hal Samples' film is also able to construct its own version of Tachowa (and I know I wouldn't trust a filmmaker who I'm pretty sure I heard say Scotland is in Ireland*) so the evening overall becomes about how a real person's life can become a story - but there's still a real living person left at the end of it.
Banksy: The Room in the Elephant by Tom Wainwright (including Something From Nothing by Hal Samples) is booking until the 26th of April at Arcola Studio 2; then continuing on tour to Bristol, Cardiff and Edinburgh.
Running time: 2 hours including interval.
*ETA: I'm reliably told that I did hear correctly, but it's a local radio DJ who gets an F in Geography, not Samples.