I don't know much about these figures and who placed them but thanks to a reader I can attribute them now to Barry McGee aka twist. Closer inspection makes me think they may be related to this unusual figure.

Five Figures, Buxton Street E1

STICKER GRAFFITI Galleries
1 2

SPRAY CAN Galleries
1 2 3 4 5

TEXT / FREEHAND Galleries
1 2

POSTER Thumbnails
1 2

STREET SCULPTURE 

GRAFFITI scenes
graffiti signs, cans etc.

GRAFFITI books / DVD's reviews

FEATURED GRAF ARTISTS
adam neate /  arofish / banksy / dface / eine / faile / space invaders / the london police / the toasters / zef