Lateral Thinking Puzzle 4 -- The London rain

London in April is well known for being very rainy and all the locals wear raincoats.

But not Albie. He is on holiday in London and has no coat or hat or umbrella.

After a nice afternoon tea he decides to go back to his hotel by walking across St James Park.

When Albie gets back to his hotel, he is absolute dry.

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PS: Look for answer in comment after some days!!