If Jim'll Fix It was still on the box, we know what we'd ask him for: a day as a member of Girls Aloud... or a day as Dr Who's assistant. After all, what could be more fun than travelling space and time with an all-knowing hero with a twinkle in his eye and a gift for saving the world while indulging in witty banter? (Or is that just us?) Anyway, after this Saturday's Easter Dr Who special, we suspect Michelle Ryan might have beaten us to it. She looked svelte and foxy as the mysterious Lady Christina De Souza (though we're not so sure about The Matrix-style bodysuit and black shades ensemble), and we loved her posh accent, too. Who would have thought it? Walford's Zoe Slater as an aristocrat! Although Michelle herself says otherwise, there are plenty of rumours that this weekend's special was a test, to see if Michelle – a safe pair of hands on set – could pair up with newcomer Matt Smith, who takes over from David Tennant in 2010. We think it would work rather well. But what do you think? And who would be your ideal assistant?