Eventually they admitted they had handled my claim incorrectly, and agreed to do all the repairs. Work started today, taking moisture readings and checking the water hadn't done any damage inside the cavity walls (which it hadn't - phew!)
They have agreed to dry out my home, replace all the door frames and skirting boards, redecorate and lay new flooring through most of my bungalow. And if I hadn't fought them over their incompetence, I'd have ended up trying to pay for it all myself!
Hoping work will start this next week or so when everything's dried out, and maybe then I'll have time and energy to escape to some crafting!