Zoom lenses generally aren't "proper macro", but "close focus".
That lens goes to 1:2, which means that at closest focus the picture area is about 48x31 mm. Compare that with the size of the target insects to get an idea of what you'll get and whether that's close enough.
"Proper macro" means that the lens goes to 1:1 (24 x 15.5 mm), and they are almost always fixed focal length.
A quick check has shown this
Micro Nikkor 40mm/2.8 at £160 (though that's including £20 cashback that ends on the 26th, and is currently out of stock)