Walking in running races

I think I have the answer to my last question - "Can I walk during races?"

Well Jeff Galloway, proponent of the run walk run system, has answered this exact question in his post If I walk during a marathon am I cheating?

He has some interesting coverage from the marathon in the first modern olympics (1896) which suggests that most if not all of the runners actually walked during the race.

Now the only question is whether I'm going to annoy other runners? Perhaps I'll play it safe and just run next Saturday at the Wimbledon Common 5k.