I understand there's a plan to build that RET (or a "semi-RET") at BHX a year from now. At least there are proposals to close the airfield 2200-0600LT for a significant chunk of the W03 season to allow this work to go on. (Meanwhile it will be closing 2200-0600LT for nine nights this November for runway resurfacing work - no, I don't know which bit is being resurfaced.)