Thanks all - I will look at the different types of software mentioned. 

If it ever stops raining I might be able to get some practise before I shoot the ones I want for real. 
"there should be no stitching errors aside from ghost people/cars/" - there ain't gonna be none of those where I'm going

And every one said, 'If we only live,
We too will go to sea in a Sieve,---
To the hills of the Chankly Bore!'
Far and few, far and few, Are the lands where the Jumblies live;
Their heads are green, and their hands are blue, And they went to sea in a Sieve.

Edward Lear
http://www.nonsenselit.org/Lear/ns/jumblies.html