Best in-house personal shopper in London?

[soundsystem]

Can anyone recommend? When I was younger I'd have gone to Topshop, but thinking maybe Selfridges or John Lewis?

I need mostly work clothes (although my work is fairly casual). I just feel a bit stuck in a rut with always wearing the same things, and I'm not sure they really suit me now that I'm a bit older and my body has changed having two children!