“A lot of her songs were to do with Blake, which did not escape Mark’s attention. She told Mark that writing songs about him was cathartic and that ‘Back to Black’ summed up what had happened when their relationship had ended: Blake had gone back to his ex and Amy to black, or drinking and hard times. It was some of her most inspired writing because, for better or worse, she’d lived it. Mark and Amy inspired each other musically, each bringing out fresh ideas in the other. One day they decided to take a quick stroll around the neighbourhood because Amy wanted to buy Alex Clare a present. On the way back Amy began telling Mark about being with Blake, then not being with Blake and being with Alex instead. She told him about the time at my house after she’d been in hospital when everyone had been going on at her about her drinking. ‘You know they tried to make me go to rehab, and I told them, no, no, no.’ ‘That’s quite gimmicky,’ Mark replied. ‘It sounds hooky. You should go back to the studio and we should turn that into a song.’ Of course, Amy had written that line in one of her books ages ago. She’d told me before she was planning to write a song about what had happened that day, but that was the moment ‘Rehab’ came to life. Amy had also been working on a tune for the ‘hook’, but when she played it to Mark later that day it started out as a slow blues shuffle – it was like a twelve-bar blues progression. Mark suggested that she should think about doing a sixties girl-group sound, as she liked them so much. He also thought it would be fun to put in the Beatles-style E minor and A minor chords, which would give it a jangly feel. Amy was unaccustomed to this style – most of the songs she was writing were based around jazz chords – but it worked and that day she wrote ‘Rehab’ in just three hours. If you had sat Amy down with a pen and paper every day, she wouldn’t have written a song. But every now and then, something or someone turned the light on in her head and she wrote something brilliant. During that time it happened over and over again. The sessions in the studio became very intense and tiring, especially for Mark, who would sometimes work a double shift and then fall asleep. He would wake up with his head in Amy’s lap and she would be stroking his hair, as if he was a four-year-old. Mark was a few years older than Amy, but he told me he found her very motherly and kind.”