If I were you I would ring the company accountant and have a chat with them before you open the software package. When we went VAT registered our accountant advised us which package to buy, (through them actually as it was much cheaper), so that they could load it at the end of year and pull off what they need. Also, if you have any queries regarding the software they would be able to help you if it is a package they use themselves!
Btw the software does all the return itself, and is rather helpful once you get the hang of it!!