Which bit? If it's the mains lead that ends in a figure of 8 connector (properly termed an IEC C7 connector) then your quickest fix is to buy one online for between three and five quid, they are an international standards so there's no risk in buying your own.
If it's the PSU and captive cable, then probably best to phone in for the quickest response - there may be a £25 non-fault call out charge if you bust it.