Tiling over tiles using cement board

Right they’re getting taken up!

It’s an old Victorian property so the existing concrete base wont be level.

Any suggestions for the self levelling screed / compound?
 
I would take them up . Skim over with levelling comp stick down boards . Lay ufh level over then tile .
As @Localtiler says you are looking at a extra height build up of 25 to 30 mm on top of your existing tiles so probably 40 mm off of the screed.
 

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