The protestors left Kennington Park at about 11:30am:
There's also a video of the march on Facebook here, and if you want to view the photos or make any comments on the march, there's a Facebook page set up and dedicated to Kennington here.
There are more photos of spitfires and tanks also processing up from Camberwell Green to Kennington Park over here which notes that the props (including Trojan horse) were created by art students at Camberwell.
Also, take a look at the photos from Peter Marshall, showing the range of different people at Kennington Park, from Latin American community groups to Councillor Kingsley Adams (local independent Labour councillor) and families to Ted Knight (old Lambeth leader). Lots of Unison members, teachers etc.
And (edit 6:4/2011), I've added some more photos of the march gathering in Kennington Park, with permission from Indymedia from whom they're sourced: