Great work John, the mono stuff is really good, I particularly like the mono rendering in 'woodlight'.
Tel, the graphic nature of graffiti makes it an ideal subject and, as you've discovered, close ups make excellent photographs. If you're interested I've done an AV on graffiti which can be downloaded here (PC only).
Lovely images Mark, as usual.
Barney, just shows what can be seen if you actually get up and go somewhere.