OK, so I don’t ride through London that often - I live in Tonbridge and commute into Croydon and for pleasure, I normally ride round the lanes in North Kent…
Today I went up to the Ace - A23, South Circ, North Circ (only route I know so far :D), but thought I’d come back down the A40 into Central London, through South London and home…
Riding through London, I noticed we started making Biker Snowballs 
I started off at one set of lights with one other rider.
Hit the next set of lights and find 2 more riders, so now there’s 4 of us.
Get to the next set and pick up a couple more, so now there’s 6 of us at the front of the line…
This went on until I was back on my own and then it all started again - Biker Snowballs! Cool
Gotta be honest though - weren’t overly happy riding through town - too many people, too many traffic lights, too many cameras and not enough room to open up (hehe… even though opening up my 125 means getting up to 60mph… woooo… lol :P)