Of all the complaints received, seven were referred to the Financial Ombudsman Service (FOS), up from two over the same period last year. The Ombudsman has decided in favour of CHL in one of the seven cases, while the remaining six are awaiting decisions.

Alongside this, CHL have also received three other decisions from FOS for complaints submitted pre-2011 – all three found in favour of CHL.

The buy-to-let lender manages over 44,000 live mortgage accounts.

Its data follows the recent publication of complaints data by FOS for individual financial businesses which covered the same period. CHL did not appear in this data, which only includes those businesses where FOS receives 30 or more complaints.

Bob Young, managing director at CHL Mortgages, said: “It’s important that CHL is as transparent as possible when it comes to the level of complaints we receive, which is why we also detail our numbers even though we do not appear in the official FOS data.

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“We pride ourselves on our low complaint levels, our ability to resolve them early, and the subsequent low number that are moved forward to FOS.

“We have seen a slight rise in complaints during the first half of 2011, however this was anticipated given the nature of the mortgage market at present.

“CHL continues to work hard to keep complaints to an absolute minimum and to maintain our focus on treating all such matters appropriately so that a conclusion that satisfies all can be reached as quickly as possible.”