is this a scam

[Unregistered]

uk national lottery online sweepstakes international, they gave there address as The National lottery
po box 1010
Liverpool
l70 1nl
United kingdom
ref:xyl/26510460037/05
batch: 24/00319/ipd

they said that i had won £800.000 on the uk online lottery.and know want me to do a western union bank tranfer.

[Nyla]

It most definitely is a scam. The UK lottery does NOT ask you to pay money in order to collect a prize. In fact, it's illegal to do so.