Remove the bump stop with a 10mm spanner, note the sequence of the parts (spring washer, plain washer, concave spacer) slide the rear brake back out of the frame (you may need to slacken the cable off) remove concave washer, remove reflector, reassemble in reverse order.
Remove the bump stop with a 10mm spanner, note the sequence of the parts (spring washer, plain washer, concave spacer) slide the rear brake back out of the frame (you may need to slacken the cable off) remove concave washer, remove reflector, reassemble in reverse order.