So, I'm now considering the oversized bayswater clutch in grey suede as an alternative. I went to the Mulberry store today and was able to try it out for size (in black patent unfortunately as they are sold out in grey). Although its labelled a clutch, it does come with the perfect length strap which fits really snugly on my shoulder, god knows if anyone would actually carry this bag as a clutch as its really quite substantial. I fell in love with the soft squashy suede on the spot, and from a practical point of view I love how its roomy without being bulky, and has plenty of useful pockets.
The store are going to see if they can find one in stock anywhere, which gives me some time to have a think about it. Fingers crossed they manage to find one!