If you need the complete desk power system then this bundle offer from Desktop Power is the perfect solution. It consists of everything you need for one desk;
1 x Protea Desktop Power Unit - 2 Power & Dual Socket Charge USB (1 Type A & 1 Type C)
1 x Oblique Underdesk Power Unit - 4 Power
1 x 2mtr mains power lead - 13A to Wieland connection
Not only does it consist of everything you need but by buying in a bundle you'll save OVER 10% than if you were to buy separately.