The circletickets.com site isn't online any more, at it looks like their tickets won't ever be showing up.
Action Fraud have received 228 reports of ticket fraud relating to the company, which has subsequently been passed onto the National Fraud Intelligence Bureau. Obviously, best to give anything relating to this company a wide berth for the foreseeable.
It doesn't look like you'll be able to get your hands on your tickets, which is a kick in the teeth, but you might be able to get your money back.
Like most dodgy transactions, if you paid for goods with your credit card and spent over £100, you should be able to get your cash back under the Section 75 of the Consumer Credit Act. You need to contact the people you have your credit card with for that.
If you spent less, or paid by direct debit or debit card, you can ask the people you have your card with to use chargeback in order to get you your money back.
Also, if you think you've been done out of money fraudulently, then you should be a good sport and report any dodgy companies to Action Fraud.