Ever since the Celeste was released in 1962 KEF has been noted for producing high performance compact loudspeakers. The Cresta, released in 1967, set new standards with the newly developed B110 and T27 drivers that were later to be adopted in the world famous BBC designed LS3/5A broadcast monitor.
I have a pair of KEF Reference Series Model 101s that I purchased a few years ago.
They were manufactured by KEF as a competitor to the Rogers LS3/5A. I've owned both and think they are both excellent speakers provided that they are used with a first rate source and amplification. I sold my LS3/5As decades ago but still own the Model 101s as well as a first generation pair of Linn Kans. I use an old Naim CDI to play compacts discs, but usually stream music through an Amazon Fire Tablet and then through a Schiit Modius dac and Lokius graphic equalizer. The signal is then sent to a either a Naim Nac 62 or 42.5 /Hicap, then to one of a few amplifiers that I rotate in and out of my system. A favorite choice is the Quicksilver Mini Mite tube monoblocks, which at 25wpc, offer plenty of power for either the Reference Series 101 or Linn Kan. I also have a mid 2000's pair of Antique Sound Lab Wave 25 tube monoblocks which also work quite well with the rest of the British gear in this system.