Dark hair like Carol's that has been lightened so dramatically is the 'most prone to brassiness so it is so important to maintain your colour with the proper products after your salon visit.' he recommends.
Take a look at our round-up of Helen Mirren's hairstyles. Her style might have changed over the years but she always looks fabulous!
If your hair is weak and fine, try these hair stying tips to get fuller tresses with minimal fuss
Achieve straight, silky hair with our pick of the best hair straighteners
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Hitting the hairdresser for your highlights appointment every eight weeks makes a serious dent in the purse, so we've chosen the very best highlighting kits to save pennies at home...