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I am a total beginner. I bought this lovely tree from a garden centre with no instructions. It looked great when I brought it home but is now starting to go browner and browner. This started a week after I brought it home. I have watered it daily..... watered it less regularly... misted the leaves...I've tried everything my beginner brain can think of but now it's time to ask for help before it becomes too damaged. I have bought a drip tray which i have filled with lava rocks to put under the ceramic pot. The window is south west facing as far as I can tell. If there is more intense sun coming in I pull the mat and put the bonsai into the shade. The plant is positioned in a cool porch area with no heating.

Maples are temperate decidious trees. They do shed their leafs in authum and grow new ones in spring. But your issue is not season, but lack of it. Indoors the tree will not experience the natural change of season it is adapted too and will eventually die. Move the tree outdoors right now and keep it there. It may need some protection in peak winter depending on your location. But never ever bring it into living room conditions again.

I've tried everything my beginner brain can think of

Did you try placing this outdoor tree outside? It needs seasons to servive, like winter so it can lose it leaves, then produce a fresh set in spring.
I don't know if a porch is considerd outside, as on the picutres it seems enclosed.
Outside it needs a place with half shade, and out of the wind.
If in full sun, this species leaves will get burned, even much more then you see now on your tree.
So when placed outside it will be needed shading by other tree's, or a shading netting.
Also on a hot day, forgetting one time to water, will result in same effect.

What "plant hardyness zone" you live in? Just checking, if you get very hard winters it will be needed some protection.

Thank you for the replies.

I live in the north of the UK. I would say very roughly our worst winter temperature would be -8°c (maybe less than a week all winter would be that cold on average - more usually -2°c-10°c) and a high of 30°c in summer but more usually 18-24°c.

Your tree should be outdoors at all times and will not need any protection from the cold.