Is there a substitute for tamari and soy as I have a soya allergy?
There are actually products that are Soy Free Soy Sauce. You can also find recipes to make your own. This Recipe for Soy Free Soy Sauce Substitute has great reviews and sounds pretty good. It is made with bouillon, molasses, balsamic vinegar and seasonings.

A lot of people swear by Bragg Liquid Aminos as a soy free soy sauce alternative, but it actually contains soy.

There are chickpea or adzuli bean soy-free miso pastes from South River Miso Company. Miso Master makes a chickpea one too.

You can also ferment your own chickpea miso, but it takes about a year. There are instructions in The Art of Fermentation by Sandor Ellix Katz.