If your excel knowledge is limited, that's fine. If you can't tick the first box though, it may be a good idea to revise any claims of strong excel skills in your CV before submitting it!
Being greasy and saying Attacat will not help your application - honest!
We start our trainees on a low salary but ramp them up quickly as you prove yourself and your knowledge increases.
If you are just out uni with zero relevant experience we'll be looking at £16k unless you can persuade us otherwise. If you can bring other experience that is of use to us or are somehow truely exceptional then up to £20k may be on offer.
Seriously: This is probably the most critical part of your application.