bbc's excellent, one and-a-half hour programme on delia derbyshire's life and work is playing again on bbc4 atm, and should be available on catch-up from the bbc.co.uk website to people with current uk-of-gb-&-ni t.v. licences (and those exempt from the same) now (or shortly), for a while.
delia derbyshire of the radiophonic workshop said in an interview on beeb r3 radio that this was a strange combination of both great fun to make, really frustrating and, eventually, because it took so long to actually get released, it became just a matter of mild regret-but-otherwise-total-indifference(!), to the (bbc) electronic (workshop) musicians who'd made it - and it was so late coming out, it only sold two hundred copies.°
i thought it was great fun and a really atmospheric album when I heard it, and ordered it from the little music shop in york immediately - it was easily worth a few walks into heslington from bishopthorpe road & back (instead of getting the - no.6 or 8? - bus in & out from number 69...
° - it presumably sold quite a few more, over the decades, else island'd not've kept it on the live catalogue; so she was probably referring to the number subbed for, plus sales in the first month or so. it was also - eventually - transferred to cd, q.v.