Radio code for Honda Civic please?

Hello, could anyone help me with the code for a Honda Civic 2004 model.

The code that comes up when I hold down 1+6 is
U 3000
L 6303
(which I suppose is 3000 6303)
I will be very grateful for the code, and thank you in advance!
Added (1). I'm in the UK and it's a UK spec Honda.

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