Bicycle Tag of bike

"1. Old and new tags must have the same bicycle

1. Old tag isn't taken until the new tag is posted (post them at the same time)
   
2. Tags must be within London (limits are the North and South Circular roads)
   
3. Tag locations must be freely accessible to the public
   
4. No reflection porn
   
5. No blank or near blank walls
   
6. No hogging the game"
   I dunno I'm just playing but those are the rules I saw.