I'm back, see you've been busy there Paddy, excellent work mate. Clean, simple and very strong.
Blue works better for me as it falls in with the rest of the shirts colours.
The only thing I would do is extend and complete the bridge and lettering at the top so that it runs out to the right border, it looks cut off as it is. You could also enlarge the car a tad so that it isn't too overpowered by the bridge. If you want me to sort the bridge email me a hi res image and I'll draw it up.
Rusty