The fos summary results for the year ending 2015/2016 were published in March 2017

3182 Investment complaints
4495 Pension complaints

Of which 1% were IFA related, and 40% upheld.
The next set of results are due at shortly.

The general opinion is that, in the main, the main area of focus for referrals to FOS continue to be:

1. Pension Transfers
2. Pension Freedom advice
3. SIPPs

Expect to see this reflected in your PII quotes this season.