The order, for 200 units, was won by Acute Sales, a distributor of Seaward’s PrimeTest 200 multi function electrical tester.  Malcolm Hird, Dyson's national service manager, said: ‘Electrical safety is a key part of our service programme and the PrimeTest200 units allow us to perform tests quickly and effectively. It is ideal for our engineers.’

Seaward said the device, which normally costs around £380, is specifically designed for field service engineers in the vending, white goods and office equipment sectors. It can perform 10 different tests including temperature measurement.