I'd ask to have a meeting with the hospital with those directly treating your partner, and ask them those questions. If you feel those answers fall below your expectations, most hospitals have liaison officers that you can then approach.

If you still feel the answers are inadequate, you're then looking at making a formal complaint against the hospital/trust/health board. Not sure what the trusts in England are called. Health boards or trusts. Then failing all that, you'd seek out a litigation solicitor.

Because no one here is a medical expert, and isn't involved at any level with your partner's care, no one here is in a position to even guess what is what. You really do need to contact those treating your partner first and foremost. Preferably your partner, as they may not even disclose anything to yourself unless a) He's deemed not to be in sound mind and b) You have powers of attorney. It's all complicated.

I've used the term "you" a lot, that's my mistake. It has to be your partner that gets the ball rolling. Due to data protection laws, they won't disclose much if anything to you without your partner's permission. Also, do keep paper records/ any emails of every interaction you have regarding this because should you not get the answers you seek, you will need paper records or emails.