Sesame topped the advice firm complaints league for the first half of the year with twice as many as second placed Openwork.

The latest FOS complaints data has shown Sipps had a higher complaint uphold rate than any other financial product.

The Financial Ombudsman’s annual review has revealed a significant increase in complaints about personal pension plans.

The FCA says complaints about financial services firms dipped by 1.4% in the second half of 2015 although it still topped 2.1m. It also says firms will be required to publish complaints data on their websites from next February.