Jonathan Hyde - Series 4 - episode 4 - Deep Waters

Frost - "So your not keen on water."

Dr. Michelson - "Water?"

Frost - "Yes you know, the sea...swimming pools."

Dr. Michelson - "To be precise because I wouldn't want to miss-inform you on what is clearly a crucial matter...water isn't keen on me. My skin is allergic to chlorine and salt which makes anything more watery than a shower a distinctively unpleasant experience. Rather like being in a room with you!"

Hahahaha gotta love that distinctive posh toned manner that Jonathan does. Always gets the good lines. Excellent actor.