Tim, We cannot grow swedes under normal conditions for the beetle, but I managed it last year under debris netting. Might have been luck.
There are also 2 types of this about. The netting I got from tildenet had the fixing holes spaced at 2 metres apart. This was more suitable for a netting cage. The new stuff we got I believe it was from screw fix have the fixing holes 1 metre apart .So it might be worth asking when ordering if they do both types.