Clydesdale Bank has been fined £8.9m for failing to inform 42,500 customers of their rights after it miscalculated thousands of mortgage repayments.
The number of first-time buyers increased by nearly a fifth in the first six months of 2013 according to figures from mortgage lender Halifax.
Over one in 10 home insurance and one in 20 car insurance customers who made an insurance claim in the past two years had it fully or partially rejected.
The Bank of Ireland has partially withdrawn an interest rate hike for 1,200 customers out of 13,500 affected tracker mortgage customers.
Just under half of all interest-only mortgages due to mature before 2020 are expected to have a shortfall according to the Financial Conduct Authority.
Missold PPI represented 63% of all complaints about financial services providers such as banks and insurance companies between July and December last year.
Letting agents must clearly display tenancy fees when marketing rental properties or they will be in breach of advertsing rules.
The mansion tax, first suggested by the Liberal Democrats before the last election, is back on the political agenda.
The government has been told it should remove the cap on annual contributions to Nest and remove the ban on transfers in and out 'as a matter of urgency'.
From the LIBOR-fixing scandal to credit card protection mis-selling, Which? highlights the biggest financial fines of 2012.