Other nations produce their own loitering munitions.
China’s come in several sizes, from the ASN-301 which looks like a virtual clone of the Harop, to the miniature CH-901.
The US has fielded the portable SwitchBlade, a tube-launched killer drone weighing less than two kilos used by special forces in Afghanistan and Syria.
The ready availability of drone electronics means more countries are able to manufacture a small loitering munition.
This includes not only large nations like Iran, Turkey and Poland but smaller players such as Belarus, Slovakia and Ukraine who produce munitions for use against targeting personnel or light armoured vehicles.
Insurgent groups like Islamic State have even been producing their own garage-built versions, based on consumer drones like the Skywalker X-8.
The drone-carried bombs used in a recent assassination attempt against president Maduro of Venezuela suggest that such improvised weapons may become common.
While the larger versions can be as pricey as guided missiles, small tactical loitering munitions such as the Polish Warmate are intended as a low-cost option.
These may be fielded in large numbers to locate and attack opponents at extended ranges. Loitering munitions have considerable military potential, but it looks like UK forces will not be using them just yet.