Hi,
Having rooted around on that site I'm wonder if it is isn't the type mentioned in this thread from the shape of the head and the lack of head and body markings.
Other than that the only thing I can think of is some form of patternless T+ albino?Swazi Rock Snake – Inyoka swazicus
The Swazi Rock Snake is large eyed slender House Snake that is extremely secretive and considered rare in much of its range. The Swazi Rock Snake is only found in the Eastern most Parts of South Africa including Losotho and Swaziland.
The Swazi Rock Snake is usually a dark Red, Red Brown, Beige, Orange Brown, to light Bright. The have a tendacy to favor rocky outcrops hunting a wide range of prey in and around rock crevices. The are considered nocturnal and their large eys help them see in the darkness. The are considered small by House Snake standards and are ussually around 40 to 50 cm with 90 cm as a maximum length
dr del