Street parties

What's your view on street parties? SamCam has applied for a licence to hold one in Downing Street to celebrate the Royal Wedding on 29 April. This seems odd to me, bearing in mind that the residents of that street, the Camerons and the Osbornes, will be going to The Wedding and the first reception anyway. Bearing in mind the large number of visitors expected in London that day, the vast numbers of police on double-pay as it's a Bank Holiday, it seems unreasonable to ask for additional security around Downing Street that afternoon. They could simply have a private party in the garden of number 10. Or do you think that since the police will all the on duty anyway, it's irrelevant?