I did some further research into putting together a Pitch Pack, or something to send to a potential publisher that covers everything they might nee dot make a decision on whether my work is something they want to pursue. Whilst currently my ultimate goal isn't to be published (rather self-publish) I think this will be a really important exercise I learning how to sell my own work in a concise manner.
Pitch Perfect - How to make the most of pitching to a publisher.
https://www.youtube.com/watch?v=wT4f1lwawDE
The key points from the above video were to be concise, understand what it is you are pitching and be sure of it; whilst working on a basic idea is fun for publishers, they often don't have the time so knowing your story outline is important! Try and stand out, embed images into the email itself and keep the clicks a publisher needs to do to a minimum. Its worth chasing up after a week or so, but leave it at that if you don't hear back. It's important to research the publisher and the kind of work they publish first too, if the work is irrelevant it's going to look worse on you in the long run, as its wasting publishers time. Check out their website to see if they accept pitches, especially if you don't have an agent.