Stanley Dynagrip screwdriver multi headed.
Seems to be £11.99 on Amazon and £11.48 at B&Q. I picked one up in local Wilkinsons store but seems to be available on line too.
Stanley 068010 has patented bit storage system for ease of visibility, access and security also with spring loaded, hard wearing, ball bearing indexing mechanism for quick and easy access.
This Stanley 068010 has magnetic bit holder for quick, secure change over of standard 1/4-inch bits with top quality patented 3 position, audible, ratcheting mechanism (forward, reverse and fixed) for life long efficiency.
Stanley have used the most up to date materials in their screwdrivers with the tri-lobular bi-material handle with textured finish this will give the users maximum torque on any type of screw and with minimum effort.
The screwdriver is supplied in unique holder containing 4 bits in addition to the 6 bits held in the screwdrivers' integral storage magazine so you have 10 bits in total to suit a variety of purposes. http://www.wilkinsonplus.com/Screwdrivers+Screwdriver-Bits/Stanley-Dynagrip-Screwdriver-Multi-Headed/invt/0247399