I should point out that this is not necessarily a bad thing, nor is it clear what the loan is for. What this tells us is that money has been loaned and secured against assets owned by CIG - this is fairly common practice in the case of commercial loans.
To bank with Coutts you must have at least £1,000,000 in tangible assets and in any event they are selective about their clientele; which implies CIG is doing well.
To be honest as much as the terms are huge, they didn't go to a loan shark neither a shitty bank. It's the bank that manage the assets of the Queen. I don't think they give loan that easily hence the huge collaterals.