Just to clarify for the benefit of others, the expression "odd days" means "as opposed to even days", not just random days here and there. So it's Nov 1,3,5, etc and Dec 1,3,5, etc. There's a noticeboard up behing the railings in front of Buckingham Palace that gives confirmation of the next ceremony. I didn't realise how poor the official website was with its information - it says "alternate days" without explaining the pattern.

The ceremony lasts betwen 11.30 and 12.15.

If you miss it, the guards for the Horseguards, in equally impressive regalia (the one with the shiny hats), go on horseback about 10.30 am every day from their base in Hyde Park, in front of Buckingham Palace to their own ceremony, and are often mistaken for the Changing of the Guard. If driving through town at that time it has been too often my luck to get stuck behind them going along The Mall, slowly, and to get the Horsey-Doos on the wheelarches of my car.