According to the latest research report from Legal and General and Centre for Economics and Business research (CEBR) in 2016 the high cost of housing means that 25% of all mortgage transactions involve parents with an average of over £17,00 being given. This follows on from previous CEBR research which showed an increasing dependence on parental financial contributions in the UK since the start of the financial crash. Indeed a 2013 report by the Halifax referred to a generation of renters and recently PWC predicted that by 2025 only one in 4 will be homeowners as housing costs have risen so dramatically.
Shelter has some interesting data on housing affordability for first time buyers. It calculated that 1969-2015, house prices rose 59 times while incomes rose 34 times, making costs much higher.
New Policy Institute also publishes reports on generation rent.
Natcen has also recently published an interesting report on the plans and aspirations of potential homeowners 18-40.
Other recent data can be obtained from HSBC website and the Halifax house Price Index.