I m planning to take him to court to recover the money I paid plus money for the damages he caused (broken window, broken tile in the bathroom so needs retiling, damaged to the garden grass, damaged engineering oak flooring, etc
Martin is spot on, have gone through similar and I believe you must demonstrate that you have given him the opportunity to fix what he has done.
You should also keep photos and record a timeline of events.
First thing to do is ring and ask him to come have a look at the issues. If no joy.
Second thing to do is email him with a list of the issues asking for a reply within 7 days or so.
You can contact citizens advice for help with the letter wording, it's on their website if you don't want to make the call.
I am sorry to hear about your trouble, hope the above helps.