i understand the concept of not having "duplicate services" as your therapist and the hospital may not be on the same page, but I don't think I get the complete "no contact" piece.
Even when I was in the hospital and fighting their care plan for me, I was allowed to call my T for support (no therapy over the phone, just to touch base), and she was included in the treatment team meetings as she was able. She had no affiliation with the hospital, and actually disagreed with what they were proposing, but she was kept in the loop. I was also able to contact her as a comfort measure.

Is there a reason they are excluding T from contact? I am not quite sure how the nhs does things, and I know it's very different from the US, so I am totally lost here... The only time I have ever heard of a client being told they cannot contact their T is if ethical boundaries are/were being crossed, or if the contact led to a decompensation of the client. Is this a concern with you? Or is it simply hospital/nhs policy to keep all treatments mutiutally exclusive? (if so, I wonder how that is helpful, but that's a question for a separate thread)

One thing I do sometimes find helpful to get through the times of not seeing my T but still wanting to feel connected is calling her voice mail and listening to her message. I don't let it get to the very end so I don't waste space in her box, but hearing her voice on the outgoing message is comforting. Would anything like that help you get through the next several weeks? I would run it by your team, but if just hearing her voice helps, it might be an option they are open to.