For all the latest news from in and around Bolton, sign up for the free MyBolton newsletterA tattoo-obsessed mum-of-two has vowed to cover her entire body by her 40th birthday.Alex Derbyshire, 38, from Bolton, revealed that over the past two decades, she has spent thousands of pounds and around 200 hours being tattooed from head to toe.Her fascination with body modification began during childhood and as soon as she turned 18 - the legal age to get inked in the UK - she began her body