its fixed!
so I got the rack replaced, and sat there turning the wheel side to side, no knocking, result I think, and expensive one but still result, then I drove off, and as I turned onto the main road "knock knock" my heart sunk! back to the garage and straight up on the ramps, year it was improved but still knocking, they looked and couldnt find anything at all, but noticed my control arms really rusty in the bush, all poly bushed, so they took them out, with some hammering! they where stuck tight, re lubed (or greased whatever you wanna call it) the bushes on it, put everything back together and its finally silent to drive! so just for anyone else out there, get these bushes checked too!