Agreed, Leeds is strict. You'll definitely need ID to get in pretty much anywhere in town, and definitely for the big nights at the SU, especially Fruity on Friday where they ID everybody. You can usually get away without it on quieter nights at the SU, and maybe some of the bars in the Millennium Square area but no guarantees. Your student card alone won't often get you in either. No point pretending it'll all be ok because you honestly will need some form of ID if you want to go clubbing etc.