By any rational definition these should be legal as they're just another straight pull like several others hunting rifles which are legal.
Based on the military appearance though this will never be allowed here.
Amendments made in 2008 to the Firearms Act 1996 gave the Chief Commissioner of Police limited powers to re-classify firearms. As the Chief Commissioner's delegate, the Superintendent of LRD may re-classify firearms that are ordinarily a category A, B or C longarm into a category D or E longarm. These may happen when a firearm has been designed or adapted for military purposes or substantially duplicates a 'militaristic-type' firearm in design, function or appearance.