It's not a cat or a bird because the spine runs straight out from the back of the skull. Birds & cats have the skull & spine join differently. It looks a bit like a bottom dwelling flatfish, eel, or something similar. By the size of the skull it would be a reasonable size creature whatever it is, (you probably only have 1/3 to ¼ of the animal).
Perhaps send the pics to your local museum and see if they can tell you what it is.
If you had the jaw it might help. Are there any teeth in it? Teeth are good for identifying things.

I think it's the remains of a bird, showing the area around the pelvis...I'm not great on bird anatomy though, don't know what all the bit's are called, or what species this could be, may have a look on the net later.
I found a skeleton of some sort of fish on a southern england beach. It's probably very common but can anyone tell me what species this is? The pics are below but some of the spine/tail is missing. It's approximately 24cm/ 8 and a half inches long and smells slightly
Thanks
Hi Dad,
I think that the skull has the jawbone missing, so it will look very different than if it where complete. This is what may be misleading. If you can imagine a jawbone added to the skull it is almost surely a fish. As to what type I am not sure but my guess would be bottom dwelling scavanger of some kind.

I'm not an expert either, but I don't think it's a fish skeleton. The skull is flat on top and seems to have nostrils, they're most visible in the first picture. Whatever it is may have fallen in the water, been picked clean by scavengers, then washed ashore.
Fish have nostrils too...
Looks like a young hydralisk, part of one anyways.
Aren't dogfish elasmobranches though (as in no trus bones)?Looks like it could be from a common dogfish