The Environment

It seems this is the official line:

I managed to speak with the franchise operator of McD Harringay, and the removal of the trees were not planned, the builders found serious subsidence and root invasion damaging the main drainage in and around the car park. As a result, they had to spend extra contingent budget to rectify it on the fly. Some of the trees were planted right on the periphery and too near the curb's edge and pavement causing them to lift and resulting in the uneven surfaces.

They are prepared to replant the same number of trees on site and if this is not possible, they will plant off site to replace the ones lost because of the unfortunate situation

I'm willing to bet that for whatever reason it won't be possible to replant the same number of trees on site.