Sorry for not picking up on this earlier. This forum has got a bit quiet in recent years, but rest assured that a lot of us are still around and in the background, willing to help.

First I would suggest a slow, gentle firing to drive all the moisture out of the structure. Otherwise known as a curing fire. Obviously only use dry, natural hardwood (kiln-dried for log burners is ideal) but take care not to let it burn too fiercely. (Try to avoid letting the flames roll around the top of the dome, basically.) You might need to do this for a full day, maybe more.
Then, I would say, remove anything that's loose. Next, see about repairing the damage (which you might need a professional tiler to do). Also, I'd suggest using refractory mortar (which you can get from Vitcas) to bed the tiles.
I think the design possibly doesn't have enough insulation, so a little bit of cracking now and again is inevitable.
Key points from me are: (1) Always build up the heat gently, (2) Make repairs as often as needed, and (3) Keep the structure covered and dry when you're not using it.
Which part of the UK are you in?
Good luck,
Rich
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