This quote from the Times relates to the disappearance of 100%+ mortgages:
Mortgages for up to 95% are also disappearing fast. Alliance & Leicester, West Bromwich, Britannia and Barnsley building societies have all reduced the maximum they will lend from 95% to 90% of the value of the property.
While all the heat and light relates to the plight of those trapped on 100%+ mortgages, the sentence above is far more important for our purposes.
Because many more people have 95% than 100%+ mortgages. And a reduction of LTV for 95% to 90% for a given deposit reduces purchasing power by 50%.
This is one of those scenarios where intuition, which would suggest a reduction in purchasing power of about 5%, is lying.
EG:
A 10k deposit and a 95% LTV mortgage enable one to buy a house costing 200k.
But a 10k deposit and a 90% LTV mortgage enable one only to buy a house costing 100k.
If you doubt it, one way to convince yourself is to do the maths trying various house values with a 10k deposit and 90% LTV.
Another is to consider the mortgage not in terms of LTV but in terms of deposit required.
95% LTV means a 5% deposit is required, whereas 90% LTV means a 10% deposit is required.
IE:
The deposit needed per pound of house price has doubled. Or the house price purchasable per pound of deposit has halved.
Interesting times!