Gluten Free Pizza Recipe

I'm posting this due to a request, but if anyone wants to try yummy gluten free pizza, here it is:

Disclaimer: This is not my recipe, though we've made some changes. The original is printed on the flour packet

Ingredients:
450g/16oz white bread flour (this is a blend of rice, potato and tapioca flour + xanthan gum)
2tsp Quick yeast
2tbsp sugar
325ml/11floz warm milk
1tsp vinegar (we used malt)
2 eggs
6 tbsp oil (we used olive)

1. Mix together flour, salt, yeast and sugar
2. In large bowl beat milk, eggs and vinegar. Add the vinegar last to prevent the milk curdling
3. Add the flour and mix to form a sticky dough
4. Continue mixing, adding the oil. The dough should be much stickier than any bread dough you've ever seen before. It should be sticking to everything and shouldn't be rollable like pizza dough usually is
5. Oil an oven dish and spread out the dough. You will need to use an oiled knife to do this or it will be impossible.
6. Leave to rise for about 30 mins
7. Cook at 200°C (400°F) in a non fan oven/180 °C in a fan oven until base is firm and nearly cooked (about 15 mins)
8. Add toppings of your choice
9. Cook at  200°C (400°F) with the fan on until cheese is melted and base is slightly crisp around the outside (about 15 mins)
10. Enjoy! 

ETA: This is how sticky the dough should be: