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How do you address an envelope to someone in the UK from the US?

I have a letter that I wish to send to someone in the UK, could someone show me the correct formatting and what information should be given? Thank you.

Name

Address line 1

Address Line 2

Town

County

Post Code.

UK.

Typically

John Smith

1, The Avenue,

Trumpton,

Lancashire,

BL99 4QT

UK.

+1

(I was sooo tempted to say "with a pen"...)