"Oh look, you’ve got damp!"
Meaning he has signs of mould or some sign of wetness coming through his walls.
You can find the full script HERE The part you want is in Part 3 (there are links on the bottom of each page to Part 2 then Part 3 etc)
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Also, please note that sentences can also end in full stops. The exclamation mark can be overused.
Sherlock Holmes 28 March 13:08
Mycroft’s popularity doesn’t surprise me at all. He is, after all, incredibly beautiful, clever and well-dressed. And beautiful. Did I mention that?
--Mark Gatiss
"I know that you believe you understand what you think I said, but I’m not sure you realize that what you heard is not what I meant."
Robert McCloskey