There are various programmes running to provide FTTP .... Fibre Cities, Rural (Last 20%), Rural (Last 10%), Community-funded FTTP, New-sites (as in being built now) and Retro New-Sites ... off the top of my head.
As j0hn points out, the retro's are usually picked if they are under 30yrs old, in fact, most of the time they will likely be under 20yrs old as this kind of estate should be purely duct work, whereas some of the estates under 30yrs old sometimes have a mixture of duct and DiG (armoured cable) in the ground which pumps up the civils cost massively.
The retro programme should be 'quick-wins' and built pretty quickly.