A depreciation of the exchange rate increases the price of imports and reduces the foreign price of UK exports. If consumers buy fewer imports, while foreigners buy more exports, demand in the UK economy will rise. If the economy is already at full employment, it is hard to increase output and prices are pulled upwards.
A reduction in direct or indirect taxation: If taxes are reduced consumers will have more disposable income causing demand to rise. A reduction in indirect taxes (taxes on goods and services such as VAT) will mean that a given amount of income will now buy a greater real volume of goods and services.
Rapid growth of the money supply as a consequence of increased bank and building society borrowing if interest rates are low and consumer confidence is high
Rising consumer confidence and an increase in the rate of growth of house prices - both of which would lead to an increase in total household demand for goods and services
Faster economic growth in other countries - providing a boost to UK exports overseas. Remember that export sales provide an extra flow of income and spending into the UK circular flow. Exports are counted as an injection of aggregate demand