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yeah, I both have the feeling it's easy and also I could totally it up and be left with a reinforced slab I have to break out. As far as I can tell you put 50mm, throw in a grid of steels, and do another 50mm on top. I'm most concerned about getting the level right so the tiles meet the door level.
Do you know if you're meant to build the drop for rain runoff into the slab or in laying the tiles?
@Colin_the_Bald is probably the right person to ask - Colin, do you do jobs in London's famous London?
Will you be pouring the slab yourself? I have to do a similar sized one for similar reasons at our back door