There is a constant drip from my shower head. All the pipes and valves are concealed behind the tiled wall so it is difficult to investigate. The tub faucet connected through the same taps does not leak, only the shower head does. What could the cause be and will fixing it require the wall tiles to be removed?

Do this: Remove the dripping shower head - but leave shower arm in place. See if water continues to drip from shower arm without shower head attached

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Milo