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Thanks for the advice but Chelsea flower show, this ain't (see chucking grass seed down and hoping for the best for context).
There are many supports and it is very stable. This needs to last 5 years max then I'm out. If anything goes wonky, boards will come up and problems will be addressed.
30p blocks are way cheaper and easier to level than 18" slabs.
If I end up living here any longer, then more money/time will be thrown at it and I will likely be paying for the valuable services of someone such as your good self.
Sorry, but you're going to have problems with your decking. The supports should be 4" posts concreted 2' into the ground. At very least, jack it up and replace the bricks with 18" slabs to spread the load. Also, get some weedproof permeable membrane and put it under the entire deck or you'll have grass growing up through the gaps. If you would like any free advice, send me a PM with your number and I'll give you a bell. PS: I build deckings for a living....