As probably previously mentioned there is the option of converting the 144s from Northern plus ATWs existing 143s (and any exGWR units they need) to e-pacer:
http://www.railtechnologymagazine.c...k-unveils-refurbed-class-144e-evolution-pacer
This would give a legal train with a toilet available to cover until whatever new vehicles arrive for the Metro routess
http://www.railtechnologymagazine.c...k-unveils-refurbed-class-144e-evolution-pacer
This would give a legal train with a toilet available to cover until whatever new vehicles arrive for the Metro routess