Bought a couple of really useful items recently, helped with the plumbing jobs no end;
First was a Monument stopcock key
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perfect for those jammed stopcocks hidden behind cupboards or positioned right in a corner where it's impossible to get any purchase on them. Means you can get that final half turn that stops those annoying drips.Second was a Stanley adjustable locking wrench
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a cross between an adjustable wrench and mole grips. Really handy on plumbing jobs because it frees up a hand. Also good for really tight fittings. Adjust the wheel then lock the clamp and it simply doesn't slip off.FYI.