This is a wonderful artefact. A series of 1974 live BBC broadcasts from the Royal Festival Hall, including all of the Piano Concertos, and also the 8th Symphony and several overtures. Outside of their own Proms season, the BBC don't do this kind of arts programming any more; even Radio 3 has recently moved away from live broadcasts in favour of recorded material. The concerts are presented as broadcast, with an urbane presenter (Basil Moss) located in one of the boxes giving some incisive background detail before each performance, reading from scholarly books (actually picking up the books and reading) and cue cards and generally not treating the audience like school children, in contrast to the current trend.
And the music making is wonderful. Both Ashkenazy and the conductor Bernard Haitink were at the height of their powers - Ashkenazy had such a profile at this time that the five concerts sold out far in advance. Both are visibly consumed in the fire of the music. The 2nd and 3rd concertos are particularly thrilling - Ashkenazy moving with the music, hunched over his keyboard, interacting with Haitink, clearly moved by the playing in some of the orchestral passages; Haitink, slim, elegant, firey and intense in those days, spurring the orchestra on. This is a fine DVD for lovers of Beethoven, and is well worth seeking out.