Hi ROSEgarden
I deal with insurance claims and from the info you have given your insurers should deal with all the damage. I dont know the specifics, but the walls, flooring, etc will need to be dried, then floor replaced, walls replastered etc. Any units which are damaged will be replaced and you may be able to claim a contribution towards replacing undamaged units, (if you cant replace existing units with a match) check your policy wording under the buildings section to see what it says regarding "matching items". Your policy should also cover the cost of redecoration of the room, and if you have contents cover should also cover replacing your carpet/vinyl flooring.
It may be that your insurers will send a surveyor/loss adjuster out to deal with your claim, the costs you have been quoted are not unreasonable for this type of work.
Contrary to popular belief insurers will not try and avoid paying geniune claims, and it causes a lot of uneccessary worry and stress because of this misconception.
Try not to worry. If you think things will dry before the surveyor can get out next week, take some digital photos, video footage of the damage as it is now, and you can show this to the surveyor when they visit.
If you have specific questions, write a list before the surveyors visit, so that you dont forget things, get sidetracked.
The surveyors are used to dealing with this type of claim, and they will know what to look for, and exactly how to deal with it,
I hope that helps,
Fiestabelle