Well that is a very good PSA. Bad news about the erections. As you have probably seen there have been a few posts about penile implants. And how very hard it is to get one. Well I think if there is anyone on this forum who can jump through the hoops I think it is you, so if this is what your husband wants (do remember he gets a say in this) then perhaps you should start now.
The arrogance of the surgeon is unbelievable. It is quite reasonable to want to know everything about this disease (though once again, OH is the patient so his wishes are the priority). If the surgery was on the NHS he is definitely entitled to his records, if private he is probably entitled to them.
A breast cancer surgeon in the Midlands was very obstructive about patient records and this hid evidence which lead to a 15 year jail term. Google the above for more.
I don't think anything is wrong with your OH's treatment, but professionals being under constant scrutiny will help them maintain their professional standards.