It could be an orb spider, going by the fat abdomen, but the legs are the wrong proportion for an orb spider of that size, they're too long. The way it's holding its legs and the shape of the thorax makes it more likely to be a hunstman. A bit of time on google image search tentatively tells me it could be Isopeda Vasta.
Thanks guys! I think spud_meister has hit the nail on the head. I googled Isopeda vasta and it's definitely the same. I just wasn't sure, I haven't seen a huntsman with such a large abdomen before!