GardenBanter.co.uk - Tomato affliction, help!

I've been searching the net for hours over the last few days and can't find anything remotely similar to whats happening to one of my tomato plants. of course, i'm a total amateur to growing stuff bar some cress i grew out of an egg shell in nusery.
The plant in question; it's leaves are yellowing to the point they appear white but this happens from the main vein of the leaf outwards.
new growth is twisted, dicoloured and stunted, even the affected flowers are blossoming this weird white colour.
old growth isn't affected... it's really hard to describe, but if you click the link the pictures will give you a better idea, i'm sure.
YouTube - ‪Tomato Problem!‬&rlm;
there's more info in the video description.
this has been happening a while now so i know it's probably not fatal but It's just doing my head in not knowing what this is!
Please help!