DAVID CAMERON will splurge a further £1.5 billion of taxpayers’ money on the military in order to finance the “battle of our generation” against Islamist terrorism, it was announced yesterday.

The PM gave defence chiefs the go-ahead to spend extra cash on new spy aircraft, including drones, to collect information on the Islamic State (Isis) and other groups.

However, human rights groups protested that more information was needed about Britain’s involvement in a “secret drone war.”

Reprieve legal director Kat Craig said: “If the Prime Minister is going to call for more spending on drones, he needs to give us some answers on how they are being used.

“There is overwhelming evidence that the UK is closely involved in the US secret drone war, which risks turning the world into a battlefield.

“Drone technology has enabled a vast expansion of secret bombing campaigns which take place without the knowledge or approval of the public.”