The private rental market in the UK is all short term lets, after the first year the landlord is free to adjust the rent. With council housing now largely gone it's an unanchored free market. Restricting supply (e.g. through difficulty obtaining planning permission) while demand increases does of course drive up rents.
Property prices are a function of interest rates and rents. Credit conditions come into play here in determining how much a prospective home owner or buy-to-let investor can borrow and pay for a property.
I agree loose credit is the primary cause. However that wasn't what my post was about, I was challenging the assertion that planning permission is easily gained. It's not.
Restrictive planning is vital for creating artificial scarcity. To ramp prices with loose credit you have to push supply below demand to create an auction scenario.