405 TD Estate wrote:
Plaster was multi finish from BnQ


The word 'finish' means it's a top coat, IE it requires a backing of some
kind, either plasterboard or backing plaster such as bonding, browning or
render.

There is an insulated water cylinder on the other side of the wall in
a cupboard

Plaster was well within the date stamp

Wall is an internal brick wall - some of the bricks have lost the
smooth oustide finish which came off removing cement there previously

The plaster was put directly onto the brick.


see above.

Today there is cracking on thinner layers put on top of the base
plaster coat as well. All carcks are quite pronounced 1-2mm wide.

It's only meant o be put on at about 4 mm maximum, any thicker, regardless
of the backing and it cracks up.

There is little you can do now to rectify this short of hacking it all off
and starting again if you want to paint the wall, but as you stated earlier
you intend tiling(?) - in which case, if the plaster is sound (tap it with
your fingernails - if it's not stuck it will sound hollow behind) then you
can tile over it, but you may require a few coats of diluted PVA to kill
some of the suction.

HTH