Final amendment for me

1 Tbl G/G
1 t Spice Mix
1/2 - 1 t Chilli (could be increased)
1/2 t Fenugreek dried leaf (got some really nice stuff from Amazon which showed that 1t was too much, my old stock must have been well out of date)
1/2 t salt
1 Tbl Tom Puree\3 Tbl water mixed to paste
Lemon juice squeezed (to taste)
1 t tamarind - concentrate watered down
Using ChewyTikka base sauce
Cooking for 4 this Friday, so will see what they think.