(Changed post)
With TTK upon us there will be many people looking for a clan. Destiny UK is a clan for casual gamers who are mainly based in the UK (not exclusively, we welcome all).
If you're looking for a casual group of gamers who are more than happy to offer their time helping people out with raids/trials etc, please reply, send a message or apply to the google+ page.
Look forward to hearing from you.
[spoiler]I'm aware this will be moved to recruitment but posts there get buried in seconds so I thought I'd post here first[/spoiler]
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From my personal experience, as an xbox player, I'd say Thunderlord or Red Death. I'd also like to add that while Gjallahorn seems to be the easy answer, it's actual rarity is skewed because of how highly sought after it is.