It's one extreme to another. Property prices are very over-valued still. However, the snake in the grass is high interest rates. This will be the deal breaker (or maker) which ever side you sit on.
There are deals to be made though. I have seen 8-12% rental returns on some properties. When to buy is only right for the person inolved in the deal. I doubt there will be a 50% decrease but then, in 2007, a 20% decline seemed unlikely.
One thing is for certain. This cycle of boom and bust will repeat itself because that's how the system is designed. In the UK, property prices either go up or down. They do not linger.
There is no specific 'bottom'.
For example, if I found a plot that returned anything over 8%, whether it be today, 2001,2007 or 2030, and could afford it, I would consider it.
No-one is going to sell whilst rates are this low. Rates will remain low until real inflation becomes unbearable for the administrators.
The question is:
What will rise first- interest rates or property prices?