Average asking price for both inner and outer London looks unsupported (or 'illogical', according to few press statements...), probably now driven too much by market 'sentiment' rather than 'actual' values.
For two quarters in a row, the average price paid by buyers in London kept lower than the average asking price for both inner and outer London housing stock (i.e. the total number of houses, flats, etc,on the market). This means an increase of the "slow moving" housing stock share.
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Analytics below show an interesting pattern in data sourced from CML and Land Registry.

According to Council of Mortgage Lenders (CML), market forecasts are more pessimistic about the future than a year ago, partly relating to the economic uncertainty from the EU referendum, but also because of tax and regulatory changes in the housing and mortgage market (see for instance changes to tax relief for residential landlords phasing-in in 2017).
However, the housing market is still considered relatively “well insulated from Brexit”, compared with other parts of the economy, as most of the activity is driven domestically. Prime locations in London might be the exceptions (see luxury market).