We didn't really need another one. There were a couple of tuneful numbers but these were not played out in full and in the main the choice of music was average. There was little in the casting in this version to hold ones attention.
It fades a bit toward the end as the screenplay looks for work for some of the bigger names to do but overall it is entertaining thanks to ABBA and Lily James. Lily carries the film between the musical numbers a lot of which she also has to lead.
40 years on and it is still watchable although the screenplay would have benefitted from being more compact it should stand up as representative of surfing youths of the time.
Karloff is worth watching in this "budget" offering. The screenplay is reasonable as a horror except that the French lieutenant character is just not believable and you would like to push the nosy obnoxious prick down the nearest flight of stone stairs.