If the property is a bank repossesson they are sold as seen so the rectification of any works is down to the buyer.
it may be possible to make a claim, after completion, against the buildings insurance which is included in the community payments. This is possible because the banks normally pay or clear all outstanding community fees, prior to completion
Fof Polaris t is still normally the developer that is selling so they still have the legal obligations to rectify snaging defects but it is important to check who the seller is
On another property we were able to get an agreement from the bank, to rectify defects, prior to completion