Langham Street house price trends

The scatter plot below reveals the house price trend for Langham Street. The graph is constructed by plotting the price per square meter by date for all sales shows sales for only W1W 7AW . The blue circles represent individual sales. You can touch or click on each blue dot to see more detail about the specific sales.

View data in table form

There are about 13 homes on Langham Street, we would have expected roughly 1 sales each year given that in the UK people sell their homes on average once every 7 years.
In the last 4 years there have been 10 property sales in Langham Street with 0 sold as new, averaging approximately 2 home sales per year . The average price per square metre (per square foot) in Langham Street, Oxford Circus is £21,904 sqm (£2,034 per sq ft), this is from the selling price of the 10 most recent sales.
The average size of all the properties on Langham Street is 75 m2 (807 sqft).