Chorley Photographic Society has been amongst the UK’s most successful clubs in the last five or ten years.
They have developed a YouTube channel where you can find lots of informative videos about photography. There are videos about camera maintenance, image post processing and lots more.
I am sure that some of the vidoes will be of more interest than others, but the one below demonstrates quite clearly how to re-size images to make them suitable for entry into competitions – note that their competition entry size is 1600x1200px which differs from the 1400x1050px that we favour. However, the principles remain the same: