I bought in 2000 and sold in 2015 for three times what I paid. The main people buying where I lived in East London, were from West London where rents were so high it was effectively cheaper long term to buy in East London. Number 47 on this page. https://www.rightmove.co.uk/house-prices/E10-6QB.html
My son-in-law and his wife had moved back in with us a year or two earlier because rents in East London had gone up. In 2015 a typical 2 bed flat in East London was £1,400 per month, West London around £2,500.
There's a simple reason why house prices and rentals in London have gone up. Demand due to mass migration. Back in 2015 London's population was at an all time high, numbers not since seen 1939 apparently. https://www.trustforlondon.org.uk/data/londons-population-ov... Many properties were bought-to-rent though that got hit by changes in law.