Wanted: 50/51/52/53cm Commuter Bike

Steel preferred, also will consider aluminium frames - just want something durable for a daily 6 mile commute along the tow path. Single speed or geared is fine-

Needs to have:

• ability to mount mud guards
  
• ability to mount a rack to the frame (use panniers w heavy loads)
  
• clearance for fatter marathon tyers
  
• good condition, no dents/rust/etc
  
  

I'm located near Haggerston, I can pay cash asap, need a bike as my other one got half way stolen! Thanks in advance