Thanks for all your lovely messages. We have been back to the vet today for another round of injections and have to return tomorrow for more. Harry is ok-ish, subdued and still lilting to one side, but he's still here for now. It's really going to be a case of wait and see. I spent last night asleep (not much) on the sofa next to sick bay, and listened to wills tearing round the palace looking for his chum. It's all very sad here!