Hi Luke.
My aunty passed away a few years ago after suffering poor levels of care from the NHS. All I can say is persevere, you will hit brick walls on the way but keep at it. Go to your local health authority Patient Advice and Liaison Service and make your official complaint. That's the first place to start, and unless you've discussed it formally with them first, no one else will listen to you. They will just redirect you back to PALS.
The next step is the Chief Executive of your Health Trust, then your local MP, and copy in the Health Minister.
The first reaction of the NHS upper echelons is to brush any complaint under the carpet, but I found that as soon as my local MP was aware of the situation, I did start to get somewhere and an investigation was conducted.
Good luck. The only way you can change poor care levels is to challenge them. Believe me, even if you get letters back fobbing you off, someone somewhere will be taking notice.