Unable to remove the temperature control knob

I am trying to change the temperature of the shower as it is not warm enough, however I am unable to remove the temperature knob as I cannot twist the outer casing to gain access to the working of it. We have the Victorian fittings. Do you have any advice please?
Asked 9 years ago by Anonymous

Not sure I absolutely follow however if you remove the end cap from the temp knob there is a screw inside that holds the knob on

Then on off lever is held on by an internal grub screw-

Answered 9 years ago by Anonymous

do you know if this is a screw cap?

Answered 9 years ago by Anonymous

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