I visited a few days ago (05/08/21) and made a species list of the reptile house, as i thought quite a few people on here would be interested.
On the inside 'island' going anticlockwise:
Black-headed python, Mindanao water monitor, Jamaican boa, Dumeril's boa, Reticulated python, Rio Fuerte beaded lizard, Jungle carpet python, Emerald tree boa, Inland taipan, Educational display: UV lizard, Exhibit empty, Sidewinder, Pueblan milksnake, Black-headed python, Black-headed python (not a typo), Greek spur-thigh tortoise, Western diamondback rattlesnake, Educational display: turtle nests, Gidgee spiny-tailed skink, Educational display: anti-venom, Central American bushmaster
On the outside (again anticlockwise):
Roti Island snake-necked turtle, Black spotted turtle, Educational display: turtle shells, Big headed turtle, Lau banded iguana, Corn snake, Gidgee spiny-tailed skink, Tokay gecko, Tokay gecko (not a typo), Turquoise dwarf gecko, Spiny hill turtle, Fiji banded iguana, Chinese crocodile lizard, Emerald monitor, Blue tree monitor, Round Island skink, Caiman lizard, Roti Island snake-necked turtle, Philippine crocodile, Gila monster, Chinese giant salamander, Dumeril's salamander, Emerald spotted newt, Aquatic caecillian, Blue poison dart frog, Emerald tree boa, White's tree frog, African bullfrog, Lake Oku clawed frog, Exhibit boarded over, Tadpoles, Sardinian brook salamander, Various semi-offshow exhibits.
Tadpoles: Mallorcan midwife toad, Common midwife toad, Iberian midwife toad
Also, there was a small terrarium built into the side of the aquarium building, past the toilets, that housed two species of caecillian (one of which was congo, can't remember the other)
If visiting in the summer holidays, i would advise going as soon as the zoo opens, or do what i did and go at around 5:30, at which point there was only me and one other person in there!
Hope this was helpful to some and not too long to read