Having recently bought and renovated a house, there is a couple of issues here......
Firstly a poster saying that not having the cert of compliance is not a big deal, well we were not even getting a mortgage and my solicitor advised not to go ahead with the purchase of the property because their cert of compliance had gone missing.
The vendor had to go to the original architect and get a the cert reissued, in order for the sale to go through how much that cost, i have no idea.....
Move on, we purchased the house and built on, planning etc the whole works.......
How can the bank be responsible for the cert, if you don't get it until the work is completed ? We got our builder, the architect visited the site a no. of times and said he was happy with he build and when the work was finished, on the architects final payment he gave me his "opinions on compliance" with the building regulations and some other cert.
To the OP, did your brother not ask for the certs at the time, i think going back now is a bit much ?
Another poster said something about kerbing and tarmacadam the driveway, that has absolutely nothing to do, with the basic structure of the property and whether it complies with building and planning regulations.
On and by the way, i was told the documents (original copies) given to me by the architect, should be lodged with the deeds as they are extremely important in the event we ever want to sell.......
I would also say, the contract we had with the architect, expressly said that the final part of his contract was to certify the build on receiving the final payment....