Just so's everyone knows :

The Scottish Coalition for Justice not War have called a rally tomorrow (Saturday) at noon on the Mound, here in Edinburgh.

Meanwhile, down in the Deep South, a similar but presumably much larger rally will be beginning at Speakers' Corner and heading for Trafalgar Square. Details here and here.
Thanks for letting us know. Haven't got £6-something to get to London with but I will make a point of mentioning it to my mates.