Hi lve dark blonde hair and my parting has most off my grey hair just there so l get blonde highlights to hide the Grey's ,but after two years it's been getting blonder and blonder and now it's looks just blonde mainly,but it's costing me £160 each time for my highlights and a trim so very expensive ,l stretch it out to about ten weeks ,as l don't mind too much the dark rooted look, but lve asked a few times wouldn't be kinder to my hair to have an all over colour but my hairdresser never answers me directly and hedges around it l think she'd make less money just doing a full colour instead,so lm wanting advise please what's cheaper what's healthier and kinder to my hair ,highlights with foils ora full head colour,and if l changed from foils to a full colour cannot be done over my bleached hair safely please help as lm due to have it done very soon and need some options on what to do, thanking you in advance ,SkinnyKay