If you are paid weekly and work variable hours, do you think about your pay (and specifically how competitive it is) in hourly rate or the equivalent annual salary?
For example - would you look at another role and think, "that roles paying £8.90 per hour and I'm on £8.70, that's a good increase" or would you look at what your hourly rate translates to annually and then compare?
I have been paid weekly for my last two jobs. When changing it was more work out (average) weekly pay rate and budget weekly. One job I was offered was slightly higher rate than the other but transport for the week would have been more expensive, so not worth it.