Neil Ellerbeck invested in a range of hi-tech gadgets to gain evidence of his wife Kate's infidelities. But it was a simple tape recorder that proved his most useful tool.
The HSBC banker recorded 127 hours of her phone calls on a voice-activated Dictaphone that he hid on a shelf in their study.
The six-inch long gadget, which can be bought on any High Street for £80, picked up everything said in the room. The rudimentary bugging operation proved so successful that he turned to more sophisticated tools, including two devices capable of retrieving deleted text messages from mobile phones. The pocket-sized gadgets, costing around £100 each, extract data from SIM cards and a phone’s internal memory.