I'm not convinced by the evidence from GPS evidence that he is at East Dulwich police station. The location shown on the map (assuming it is accurate) is a few streets away and would possibly be on Landcroft Road. Which was mentioned by somebody claiming the same name in 2008 on a local councillor's blog.

This could be where he was arrested at 6am this morning before being taken to the police station just round the corner.

Fortunately the newspapers have better leaked information than a map on a website.