Clearly proposal has not been thought through
Reading the document, it seems little real consideration has been given to the existing uses to which the 1800 MHz spectrum is put - I found a single handwaving sentence about possible use of a few other spectrum bands. Which is rather odd given that point-to-point microwave links is probably going to be the best way of creating a performant backhaul network for all those rural 4G cells...
I do get the impression that the UK 3G spectrum auction, has clouded spectrum licensing authorities thinking, seeing huge pound/dollar signs whenever the mobile networks ask for more spectrum...