I'm pretty sure you'll get an airborne warning if you get close to it too. I was warned about one of these at Kemble when I last returned to Kemble.

Andy

The NOTAM will appear in your NOTAM briefing as it should. We would love to display an actual block of controlled airspace, and we are working with the CAA in order to get these NOTAM better promulgated. In the meantime it is difficult for us to practically do this. Stay tuned.

I  don't get a warning if I plan a route through a temporary airway. Today it's Class D NW of Kemble, last Saturday it was Class A over Leicestershire. The only indication is a faint dashed centreline, from which it is hard to get the pop-up message, and there is no indication of width. I haven't flown the routes, but assume there will be no airborne warning either. These NOTAMs seem to be coming more frequently, so is there any way of improving the visibility of them and getting warnings?