I've used Double 8 several times and they've always come up with the goods - the tickets they promise at the price they advertise. Most recently, I got excellent tickets to see the Rolling Stones at the 02, when they'd sold out in 7 minutes. Tickets come well in advance, so you don't have to suffer those 'will they, won't they' turn up worries, and you can always talk to real people who actually answer their phone line! If you just have to get in, and there aren't tickets available, Double 8 will sort you out with a service you can rely on.
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