It's called the "HL Compact 7ES-2" or "C7"
They are totally different speakers. The P3 is tiny, shoebox sized. The C7 is fairly large, with an 8 inch mid-woofer and big cabinet, about 20 inches high by 11-12 inches wide and a little deeper than wide. The C7 uses Harbeth's proprietary RADIAL material in the woofer cone, whereas the P3's woofer is made of polypropylene.
I replaced my first original P3's with C7's a few years ago, and moved the sub into another room with another pair of P3's. The C7 is much more dynamic, playing as loud as you'd ever want and filing the room with life sized performers, plus has this microdynamic finesse (little tiny variations in amplitude) and clearer and more natural in the midrange. I don't use a sub with the 7's, and don't miss one at all.
As good as the P3 is, and it's a steal at the price they sell it for, the C7 is markedly better.
Paul