Stanley 10mm x 250mm Magnum Flared Tip Flat Head Screwdriver 1.2/6.5/250 67-427 | eBay
Facom T Handle Screwdriver Flat Head (Large) AGT 10mm x 100mm - £34.95 : That's a Wrap, Consumables Superstore
CK Dextro VDE Slotted Parallel Screwdrivers - Comtec Direct
Gestalt Tools 200mm Flathead Screwdriver - Large Heavy Duty Flat Head Screwdriver with Long Shank and Magnetic 8mm Flat Head Tip : Amazon.co.uk: DIY & Tools