JW411's Tuneable Beam Approach, not Standard Beam Approach, remember the coffee grinder in the Provost's cockpit, at Ternhill was N's to the right. I remember because on runway 23 the N's meant that you were north of the centreline. In about 1948 at Aldergrove a Halifax flattened the BABS van. lost it's port wheel and made a final untidy mess on the runway. I don't know the serial no but it was coded YE@H.