Bosch Professional 2607017464 40 Pieces Drill Set ( Extra Hard Screwdriver Bits, with Universal Holder), Set of 40 - £15.26 @ Amazon

• Can be customised: The adaptable extra hard screw driver bit set offers the right tool for every work area. Bits can be swapped as needed to mix and match sets
• Click-in system: The bit bundles engage securely in the click slots and you simply need to press the release tab to remove and change these
• robust bits: Made from S2 modified steel with an optimised heat treatment process
• Reduces vibrations: The bits have a pointed torsion zone that absorbs forces and vibrations in order to handle torque peak without any problems
• Compatibility: All bits have a ¼ external hex shank, compatible with screwdrivers and drills

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added by @JRSC01

What the bits, letters and coded colours mean...
PH - Philips - BLUE
PZ - Pozidriv - GREEN
SL - Slotted - RED
T- Torx - YELLOW
H - Hex - GREY
The numerical bit size codes do not necessarily correspond to nominal screw size numbers - but the length of the bit is shown below.

‎1 x PH1 - length: 25 mm
2 x PH2 - length: 25 mm
1 x PH3 - length: 25 mm
1 x PZ1 - length: 25 mm
2 x PZ2 - length: 25 mm
1 x PZ3 - length: 25 mm
2 x T10 - length: 25 mm
2 x T15 - length: 25 mm
4 x T20 - length: 25 mm
4 x T25 - length: 25 mm
2 x T30 - length: 25 mm
2 x T40 - length: 25 mm
1 x SLx4 - length: 25 mm
1 x SLx6 - length: 25 mm
1 x H3 - length: 25 mm
2 x H4 - length: 25 mm
2 x H5 - length: 25 mm
1 x H6 - length: 25 mm

1 x SLx5 - length: 60 mm
1 x PH2 - length: 60 mm
1 x PZ2 - length: 60 mm
1 x T15 - length: 60 mm
1 x T20 - length: 60 mm
1 x T25 - length: 60 mm

1 x Quick Release universal holder
1 x storage box