Fuzz!
They've also re-run the algorithm that fuzzes out car number plates and faces. It's managed to completely obscure my number plate on the 2008 photo (originally one letter could just be made out), several bricks on the wall beside my front door (nowhere near the house number) and a bit of the tree in the neighbour across the road's garden! It HASN'T however, fuzzed out the face of one my cats sitting on the doorstep - maybe it decided the cat's face was fuzzy enough!