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Posted this guy on the rat snake forum.
The best guesses for an ID were a Corn or Great plains crossed with a Yellow or Texas Obsoleta.
The guy that I took her from stated that she is a 'Mexican Yellow', named by the guy that bred her.
My guess is Great plains ( Sometimes called a Mexican Corn ? ) crossed with a yellow rat... giving that the breeder should know what he was crossing.
Georgeous animal though...
In my opinion a yellow rat hybrid or cross would be predominately striped as in the greenish rat. Do you suspect this to be a hybrid for any particular reason other than it being unique?
Hi Tony.
The reasons I suspect it is a hybrid is really the colouring and the patterning. There is the obvious Gutatta arrow on the head, this is identical to corn snakes and from images I have seen, Emoryi have the same pattern. I tend towards Emoryi genes instead of corn because of the size of the snake. It is less than 4 feet long and is a good 4-5 years old.
Another point is that nobody has ever disputed that it is a hybrid. It must have been captive bred since the guy I got it from had it since a hatchling and none of these species are native to the UK, and the guy he got it from called it a 'Mexican Yellow', this was presumably the guy that bred the snake.
The colouring is not in the slightest like a gutatta, that seems like obsoletta. Some on the rat-snake forum pointed me towards the orange phase texas rat, and I have to agree the colour similarity is very close, especially the whitish spacing in the middle of the saddles. Personally, I would have expected the snake to be bigger and more temperamental if there was texas rat in there, Corns are pretty nervous at the best of times and if texas rat was added in, I would expect one very highly strung animal. This one has never looked like biting anything or anyone.
I know there are some very calm texas rats out there though and who knows what size a gutatta x obsoletta is supposed to be ?. I am always prepared to be wrong 
Steve.
nm
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~Katt
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