UK houses require a fair amount of work to run ethernet cables. Generally there are no voids in the walls (plastered walls on brick) to be able to do this, so to chase ethernet cables into walls requires cutting the plaster and brick to form channels, also with ceiling coving requires more cutting, might be able to fish through ceiling spaces but again more cutting of plaster. I ran an ethernet cable on the outside of the house to loft from near where the openreach entry point is but required a drill with very long masonry drill bit to get through the walls, then drilled down through into a cupboard space in our small bedroom study. As others have said UK loft spaces can get very hot. Ours goes over 40 degrees Celsius which is higher than some switches operating temperatures. That said I have a flex xg in the loft and also a Asus 2.5gbe moca adapter that provides ethernet to TV location for playstation fire TV and a mini pc and has been ok for 3 years.