I'm currently wearing some M&S bras which I find lovely and comfortable in the day.
BUT at night, when I feed lying on my side in bed, the boob not being fed from makes a bid for freedom out of the cup (or succumbs to gravity) which means it comes away from the pad and I often end up very wet (I'm a leaker from the non-feeding boob in a big way!). I'm definitely not as pert as I once was and I need something to keep them in order a bit more 
I've looked at the sports bra style in Mothercare as I thought maybe a bra with less definition might control the toppermost boob a bit better but thought I'd ask here for recommendations before parting with hard earned cash.
I'm not that big (38D in the M&S ones) but they're just suffering a bit with age and use 