In reply to Pesda potato:
cheers dudes, i tried the decathlon vest yesterday evening, just a short run around the local paths, 2 front bottles and about 1.5l in the bladder, felt pretty good, although im not likely to need both bottles and bladder, I agree there isnt much easily accessible storage however Ill probably use bladder, 1 soft bottle and the other pouch for snacks. The two side pockets are really hard to reach on the go, but will be useful for toilet paper, and other items I wont need on the fly.
Only other comments are that the main compartment holds quite a lot and is zip expandible and bungeed which is a great feature, the zips are rubberised so dont make a noise, the only other downside is fairly odd access to the main compartment via a velcro tab from the top.
I think if I need to use this with extra storage Ill use a small bumbag / waistbag to carry food or other lightweight stuff.