Today I'm donning my plumbing gear and delving into the world of Mario!

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We have one of those double-tap-showerhead things.. You control the temperature/flow with the two taps, and they either output down to the bath or up to the showerhead, based on the little nobbly uppy/down bit in the middle.
The little nobbly uppy/down bit isn't working, and if you push it down so the water flows from the bath taps, the showerhead still flows, meaning when you lean over the bath and turn the taps on, you get drenched from above..

Needs a fix.
I've done some investigations on the old YouTube front, so am prepared for everything.
Nothing could possibly go wrong.
This will be an easy job.

It's Friday the Thirteenth..

Bugger...