What should we stock in our new London shop?

If I want to pick up, say a 14tooth DA cog locally I could go to three shops and not get it, one shop wouldn't do track stuff at all, one would have a 14t but it would be shit quality and the other would have DA cogs but not in a 14t, I would waste half a day and wish I'd just ordered it online.

I actually have DA cogs which come with purchased wheels and bikes. I tend to buy those track bikes and they never come with anything handy like 16-17t.