A member of staff queried a few things in the wording via e-mail, but I was able to speak to them and amend it, and the Trademark got registered.
I think to a certain extent whether you decide to do it yourself depends on how critical your Trademark is going to be to your business. I'm sure there is the potential for things to turn into a minefield down the line, and I'm sure that an experienced Trademark lawyer would help you avoid them, but for me I was happy to do things myself and learn about the process. If you asked me now whether I need the Trademark, I'd say maybe not, as I own all the critical domain extensions for this term, and since then I've bought some better domains for the particular type of website the trademark relates to, but it was a good learning experience for me.
Rgds