AndyS
April 2018

The way this situation should be signed these days is by a sign using the layout shown in TSRGD Schedule 12, Part 5, Item 5, varied as appropriate, backed up with an 877 as needed, as Simon says above.

If gantry signs are present, then something along the lines of Figure 2.3, 5.2 or 5.3 from IAN 144 might be appropriate.