Tap Magician compatible spares / parts to repair the Hudson Reed Lennox concealed twin mixer showers SQR3210 This is the Flow control on / off cartridge compatible with SVR21 (SVR21W).
If your temperature is no longer working or has issues then you need a new thermostatic cartridge assembly. The thermostatic cartridge is genuine manufacturer part. SC50-T20
For guidance / instructions of how to replace a tap valve step by step please
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If your tap is dripping or leaking then it is time to replace / change the quarter turn ceramic disc cartridge.
Cartridge has 20 teeth on spline. 87mm tall. Opens Anti-Clockwise.
How can I remove my HR lennox shower head/lever handle? Use Allen key to undo grub screw on the underside of the handle. The handle will then pull off and you can access the cartridge. The Cartridge may be known by Valve, insert, gland. This will unscrew from the shower anti-clockwise.