Hi
As an employer myself, and looking at the comments, the risk assessment does not seem at all satisfactory.
They should offer you alternative employment within the company if available which you would be happy with , or as they already offered you to go on leave early.
I would review your contract, and see what you have signed.
I understand that you probably want to work up until the last minute, but to put it bluntly when you took the job on you knew the risks involved. If you are not comfortable at all then i cannot see any alternative apart from to go on leave early.
Sorry to be blunt,