I found the Syrians holding a protest opposite Downing St when I arrived with the NHS marchers, and took out just a few minutes photographing them before continuing with the NHS protest, returning for another few minutes as this ended.
One image I photographed was of a young woman, and I took it both as portrait format and landscape format. There are other slight differences, but I think in most respects I prefer the upright format which fits the subject and her gesture better.
More at Syrians Ask For Support.