I like Irwin pliers, I meggered my non VDE set several times (one terminal on the head, other on the handles) and got >1000MOhm at 1000v, methinks the only diff is the VDE ones are certified the blue/yellow ones aren't
I also have a forge steel set of VDE pliers/side cutters and for the few quid I paid for them, they're surprsingly good
I bought a swann morton retractable scalpel...best thing I've ever bought for slitting cable sheathing etc...far sharper than a stanley knife and a lot more accurate
Adjustable - Irwin visegrip again, no slack and no play in them at all...
Spanners - Torq in B&Q are ok no better or worse than halfords advance (though halfords have a lifetime no quibble warranty on the advanced stuff (cheaper still if you can blag a trade card - make up a auto electrician / mechanic business card / letterhead - pair of manky ovies also helps

) Though I also have some cheapo silverline/lidl/aldi spanners and they've all lasted well and been fine for fit
holesaws for wood/metal - punk M42 from toolstation
Screwdrivers - Wera Lasertip VDE, only VDE drivers I get on with...have a bahco PZ2 and its horrid...just strips the heck out any screws you put it near...why its not met a bin yet...I have no idea...
SDS bits - Dewalt / Bosch / CK (I really like the CK bits but a mare to find locally)