That does look like good news. Well done.(posted 8073 days ago)The wording of the letter looks fine to me provided the names of insurers in it includes all the insurers that you think were involved with your mortgage.
I presume you know if there were any guarantors or partners that could now be chased.
Others with better legal brains may well comment on the wording of a response letter. I will try to find one for you. I do have one somewhere.
Remind me if you don't hear from me in a couple of days.
Well done!
Lee