Eamonn Butler's letter regarding Oyster Card rewards features in the Evening Standard

Dr Eamonn Butler, Director of the ASI, has had his letter regarding Oyster Card rewards for the theatre featured in the Evening Standard

Sadiq Khan's planned Oyster Card rewards for theatre tickets sounds both wooly and unfair. The money to subsidise these tickets has to come from somewhere. Why should, for example, brick layers in Barking pay higher Tube and bus fares to subsidise people going to the theatre?