I have a tap. I am struggling to work out how to change the main washers. How do I get access to the main washers?

I can not identify the tap, so answer will probably be speculative. Just tell me what experience you have, and what you would do.

What I have done so far.
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I undid one bolt, and the front comes off.

[![Over view of he taps](https://i.stack.imgur.com/23ywI.jpg "Over view of he taps")](https://i.stack.imgur.com/23ywI.jpg "Over view of he taps")
[![The tap handle after it is removed](https://i.stack.imgur.com/sWkyZ.jpg "The tap handle after it is removed")](https://i.stack.imgur.com/sWkyZ.jpg "The tap handle after it is removed")

I believe that the two small washers that are visible in the 2nd photo (the one of the tap handle), are not the washers to turn the tap off. I think they are to stop leaks along the shaft.

Some experimenting upholds the hypothesis that the tap handle pushes and releases an inter hidden bit, that in turn blocks the flow of waster: By pushing the inner hidden bit, I can modulate the flow of water (this was done by setting the isolation tap, to restrict flow. So pressure was low).

Next I looked at what is now at the front (after the tap handle is removed).

[![The mysterious hex](https://i.stack.imgur.com/1xIfq.jpg "The mysterious hex")](https://i.stack.imgur.com/1xIfq.jpg "The mysterious hex")

Option 1
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There is what looks like a hex nut, but is it. I see not seam between this and the main body. Should I attach my grips and apply lots of force? Or is it just decorative?

Option 2
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Go in from the back.
[![View of where the tap is attached](https://i.stack.imgur.com/85qNH.jpg "View of where the tap is attached")](https://i.stack.imgur.com/85qNH.jpg "View of where the tap is attached")
If I remove both of the attachment bolts (I will need to isolate hot and cold, as same time, to do this), will I be able to gain access from the back?

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Images licence cc-by-sa ctrl-alt-delor [How do I change the washers of this tap?](https://diy.stackexchange.com/q/198652/76435)