One factor that might be affecting the housing market is the changes to rules around landlords:
In 2016, Buy-To-Let stamp duty rates were increased, by relatively small percentages, but obviously a 3% increase on something worth over 250,000 is a lot of money!
In 2017, tighter rules were put in place on lending Buy-To-Let mortgages. The new rules say that a landlord's whole portfolio must be viable. There's also a new stress test on Buy-To-Let mortgages- the landlord must be able to make repayments, even if interest rates go up to 5%.
From 2018 onward, there are changes to how landlords can use their mortgage interest payments to offset their profits. Landlords who are higher rate tax payers won't be able to offset this at all, while basic rate tax payers will have to take a basic rate tax deduction, rather than a deduction from profits.
None of these factors on their own are huge, and I don't imagine they will cause a large sell off by landlords. However, some of these factors may stop landlords buying more property (reducing demand) and in some cases, they might be looking to sell less profitable properties or may decide to sell for tax reasons (increasing supply). It's not enough to cause a crash, but in some areas with high numbers of rental properties, it might cause a slow down. In June 2017, the council of mortgage lenders reported that the number of Buy-To-Let mortgages they were issuing had nearly halved since the same month in 2016.
I don't know enough to make predictions about house prices, but I do think this is a factor to bear in mind when thinking about house prices over the next couple of years. Obviously Brexit will have a much larger effect, but that's harder to predict.