I'm far too much of a scaredy cat! I paid Ł37 for a colour last time having decided highlights were getting far too expensive (and took too long - foils on long hair seem to take forever). I went a tiny bit lighter than my natural colour (the chart said medium blond but think light mouse) and 6 weeks on if I look carefully I can see a good half inch of root but the colour's so close you'd not spot it from across the room. I'm hoping for another three or four weeks before I get it redone.