I bought this for my sister last Christmas. I see that it's no longer available but maybe you can find it somewhere else.
https://www.amazon.com/gp/product/B01LD3ZHOG/
There are also several other 14" cast iron pizza steels on Amazon that you can look at. Not sure about shipping to the UK though.
And yes, 270c, which is about 518f, is plenty hot enough to make a pizza.