Thanks for posting the photos Alba.
Frank, I have tried the LFD Zero LEIII with the Harbeth SHL5 non-Plus about 8 or 9 years ago. The LFD has an illuminating sound with a sweeter and more tube-like presentation than Naim and most solid state amps I have tried with the Harbeth. Very good clarity and speed as well with tight and clear bass lines. During that time the LFD was directly compared to my much costlier Plinius and Audio Research separates driving the Harbeth SHL5. The LFD made the separates system sound broken.
The Nait XS together with the Rega Elicit were brought in later and to be frank both didn't have the special engaging sound of the LFD when matched with the Harbeth. However, i didn't pick the LFD as the deal breaker for me was the below par build quality (cheap looking case) and the lack of remote. I later tried the Naim 202/200 and the Harbeth sounded quite admirable with these which i think is a decent step up from the Nait XS. The 282/250Dr with Chord Signature cables throughout sounded a lot better.
I am not sure how the 282/250DR will compare to the LFD on the Harbeth but I am not bothered now as i have stopped looking. The 282/250 is quality, producing an engaging and robust sound with the SHL5 Plus speakers. There is now the LFD Zero MkIV and V, and also the top of the range NCSE. You may try the LFD if you have the Harbeth to see if you like it, provided you can accept the aesthetics and the lack of a remote control.