Serving you notice before you've even moved in sounds like a pretty shady practise to me, and one that I'd be inclined to challenge before I signed anything. I

Serving you notice before you've even moved in sounds like a pretty shady practise to me, and one that I'd be inclined to challenge before I signed anything. If they attempt that sorts of trick before you've even paid them a penny, that doesn't bode well for the rest of the tenancy in my opinion!