This is interesting:
"The 1956 Act restricts only two matters: it prohibits recording the broadcast for commercial purposes"
"In respect of the first point, a recording is not made for a commercial purpose (i.e. a non-private purpose) unless it is offered for sale; so where a recording was made for home use, and is not subsequently offered for sale, at no stage is it used for a commercial purpose"
"The effect is that it is not an infringement of copyright to record or copy a broadcast made on or after 1 January 1959, unless it is done for commercial purposes (i.e. for payment)."
I did not make the recordings (from the radio) for commercial purposes and never intended to sell them, but intend to use very short and likely unidentifiable clips from them in music recordings which could potentially make me money. I am selling my songs, not the radio recordings.