Have got my printing problems sorted! Mum's company can print sheets of paper 900mm wide by 1800mm long and they have methods of splitting large images up into these sheets. Cost will be minimal too - just the price of paper and ink. Yay!

Am sad not to be using vinyl because it would have looked so good, but it's just too expensive and the guy made it sound pretty tricky to put up. At least using paper I can use paste, or lining paper and spray mount - nice and simple.