I have discovered that you should shop in the ethnic/world food ailses. :o
The spices are like half the price, get some cheap storage jars from Poundland to store them in (or even old coffees jars), Huge bags of rice for 7 quid, and Pataks curry paste is cheaper there too.
Also I spotted coconut milk for 89p , as opposed to £1.79 in the Amoy Range, and a HUGE bottle of oyster sauce was £1.70 as opposed to £1.30 for a tiny wee bottle.