WARNING Barclay's Cycle Hire is a scam. I used a bike in London a couple times, no more than 2 hours. WARNING: docking doesn't work properly. I assumed the charges would be as advertised: 6 pounds for 2 hours. WRONG. A month 1/2 later I got my bank statement and found a $165.10 charge for Barclays Cycle Hire.
So then came the hassle of 1) trying to call overseas to straighten this out 2) no documentation to prove the charges are wrong. 3) non-helpful contact forms 4) non-helpful customer service folks
After several expensive international phone calls, and they told me I would probably not get a refund.