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Just fitting concealed lavatory cistern as part of bathroom re-furb.
It is an Ideal Standard Conceala with dual pneumatic buttons attached
by air pipes.
Across the top of the cupboard like unit, a worktop will be fitted
into which a wash basin will be set and sealed with silicone to
prevent the worktop turning into soggy wheatabix with the wet.

So, when the Torbeck-type valve gets a bit of grit in it and needs
sorting how do you get back into the unit? The guy in the bathroom
showroom said, "They never go wrong". All it takes is a bit of work
on the water main up the road and grit gets in. Also the washer will
wear out over time.

Ideas, please.

We have one of those, or something very similar. The buttons we chose are
mounted in a rectangular chrome (effect) plastic plate which we've got
mounted directly above the cistern (a cut-out in the worktop). This plate
removes quite easily (it's spring clip mounted) and enables essential access
to the valve.
Alternatively, there are loose fitting cover panels that simply rest over a
cut-out in the worktop.
If your basin is only fixed to the worktop, then it would be possible to
remove the whole lot (after disconnecting the tap tails and waste). But
that'd be a pain.