Help!! Repairing Lever Power shower

[spark65]

As women do, her in doors has attacked the power shower and, in a word, made a fine mess!

Basically, it is a lever mixer shower installed into the tile and then the shower head and fittings are fixed above with the feed pipe running up behind the tiles. Shower is about 7 years old and she was simply wanting to change the shower cable and head.

Surprisingly, this was not a simple twist off/on and would appear to be on a swivel gland, of something of that ilk. I will try and upload some pics, but any clues welcome as to how to remove this and change?

BTW, no clue as to the type of shower

Thanks