I applied a couple of years ago for a trainee driver at WMT. I put my closest depot instead of one that's in the vacancies and didn't get past the sift. A year later, I put in an identical application but with the depot chosen being one that there are vacancies at and got through.
Now, I'm not saying it was the cause of me not getting through the first time. But personally, I think it's best to choose a depot where there are actually vacancies at.
Please feedback though what happens, I'm genuinely interested to see if it does have a bearing. I don't think it will...it was more likely I had some silly mistake that I missed in my first application.