It depends upon which grounds the mono metal ban was based...according to Edinburgh Rifles when they were tested at Bisley there was no difference in mono metal and jacketed lead from a danger point of view but they still chose not to lift the ban.
But given that the lead free EP ball ammo in the BAE link is gilding metal jacketed steel core, it is not mono metal....even if the hardened steel core is armour piercing and ricochet prone...
So if they do maintain the mono metal ban it will only be the frangible jacketed lead free bullets that can be used following a range lead ban...Evo Green, Hornady MPG, Brenneke TUG and etc.
Unlikely?
Alan
Ed has never produced any evidence of this and the NRA have never published anything