Oh dear!
You are discovering why I always say, "if it isn't an NHBC warranty walk away!"
CRL warranty by BuildSafe is an insurance policy and from what I can see from the website its main purpose is to give cover for developers and builders who cannot get warranty anywhere else - not protection for buyers.
You have to ask why, if it is any good at all, consumers and everyone else cannot access the policy documents online.
Having looked at Beechcroft's website "About us > Customer Service" it states:
"Beechcroft homes are constructed to the highest standards and come with a 10-year structural warranty from the National House Building Council"
So perhaps you have been mis-sold?
Surprising that a retirement developer would have so many issues.
Apart from the poor value and excessive management charges that is.