Hi Jimbo!
You write it like that:

Metallica
The O2
Peninsula Square
London
SE10 0DX

And at the bottom of the envelope you add: Please forward to metallica on 6th dec
Hope this helps! ;)
Good luck!
Urša

I was wondering, when i send VV, how do i write out the envelope,

is this right?

For example

Please forward to Metallica on 6th Dec
The O2
Peninsula Square
London
SE10 0DX

Or, would i put

The O2
Peninsula Square
London
SE10 0DX
(Please forward to metallica on 6th dec)

Im not sending to metallica btw, just made that up !

Thanks, Jimbo.