I don't know how this works in England, but here when a letter is created in the hospital it is sent to the GP instantly, and appears in the patients electronic records, and a record kept on the hospital records. If that's how it works in England then it's entirely your GPs fault that you haven't heard. There's no paper involved.
I agree with Bubbsie, it's utterly outrageous that you haven't heard. There is no excuse. That said, I still think if they haven't been in touch, then it is extremely unlikely that there is anything to worry about, but that is for you to decide, not your GP.