Barclays was the most complained about active lender in the second half of last year with almost 80 complaints per 1,000 mortgage accounts on its books. Only inactive lender Northern Rock Asset Management received higher levels of disgruntled borrowers with 113 complaints per 1,000 customers.

Beneath Barclays in the complaints league table was Blemain Finance, now operating under the Together brand, with 49 complaints for every 1,000 accounts. This was followed by inactive lender Bradford & Bingley with 46 complaints per 1,000 accounts. Shariah-compliant home finance provider Al Rayan Bank was next with 39 complaints per 1,000 customers.

Contextualised complaints by product group