A lot of Leeds based agencies have apartment in Clarence Docks as do a fair few indies. I am aware that a few have been raided in recent years mainly ones with several EE girls working at one places. I would personally park in the carpark as when I worked there I was always getting parking tickets at all times of day and night (albeit must admit I once parked in a loading bay at 2am I was still suprised to get one at 2.30am)
After 8pm and until 8am streets with single yellow and no yellow lines are fine ie Chadwick street as already mentioned .