There wasn't much chance for sketching outside while I was on holiday due to the freezing weather and me being too much of a wimp to sit in the cold. The above is a crow from a London Park from one of my photos.
This is my moleskine and I sketched the view from my mum's front window while sitting next to the heater.
Of course I have a selection of airport sketches too and the backs of people's heads... all the 'lovely' things you find to draw to keep the boredom away while travelling.
I took a mini sketching kit with me that fitted in my coat pocket, but found my Lamy Safari pen leaked under the plane's cabin pressure, not good when your ink is the indeliable (bullet proof) type!