if bike is not as described open a dispute with ebay, send the bag of shit back from whence it came. at the end of the day £200 isnt cheap to most people is it. if keeping check out this link for half decent forks on a budget.
rear shock will be tricky. may just need setting up. some springs are for heavier guys so if the lad selling it was a big guy it wont work aswell for a smaller guy. shox can be an expensive do. what size is the rear shock.