LondonFGSS-on-sea - Brighton fixies

Hey Lewis, I came in the shop on Friday and bought a new cog so I have half a chance of getting up Southover st. Anyway a chap had a quick go at getting my current cog off and had no luck, can you let me know when the shops a bit quieter so someone could have another go at shifting it.
Or if anyone else out there thinks they could help me get this darn cog off...

if you like i can bring my cog/lockring tool along tomorrow if you about, or try popping in in the morning it usually quieter then! we should be able to do it there and then