Hi Hatbeard
This is what I was thinking when we spoke via PM before. The distance from your house to the nearest pit is quite extensive and the architecture of the network in this area has a requirement for a new duct to be fitted from your home all the way back to the closest pit.
While in theory this should be possible, the area is traffic sensitive and the footpath looks quite congested with other utilities so this would be a major effort to get service to your flat. Having said that, there appears to be a number of properties on this street in the same situation, It may be worth dropping an email to
cablemystreet@virginmedia.co.uk with your address and contact details and the team can look into this for you.
Hope this helps and hopefully you can get service in future!